Brake Balance First
2-piston, 30.95 cm² caliper area sized to complement front BBK clamp without over-braking the rear axle or triggering early lockup.
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 12 - Jul 17
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Circuit Racing TR20 Rear Wheel 2-Piston Big Brake KitRacing Series Circuit Rear Axle 2 Piston TR20 Rear 2 Piston Racing Big Brake Kit The TR20 is a lightweight 2 piston rear racing caliper built for teams that need rear brake contribution to be consistent, measurable, and tunable. In a proper motorsport package, the rear axle is not judged by peak clamp alone it has to support the front, hold bias, and keep the pad compound window usable across a full session. Built around a two piece forged aluminum
Racing Series · Circuit · Rear Axle · 2-Piston
TR20 Rear 2-Piston Racing Big Brake Kit
The TR20 is a lightweight 2-piston rear racing caliper built for teams that need rear brake contribution to be consistent, measurable, and tunable. In a proper motorsport package, the rear axle is not judged by peak clamp alone — it has to support the front, hold bias, and keep the pad compound window usable across a full session.
Built around a two-piece forged aluminum body and racing pistons without dust boots, the TR20 is engineered for track, drift, rally, and endurance use where thermal repeatability and pedal consistency matter over repeated high-energy stops. Each kit is built through a vehicle-specific workflow so rear bias, rotor package, bracket geometry, brake line routing, and wheel clearance are confirmed before production.
Why Builders Choose the TR20
Rear-Axle Control
Built to support the front brake package, hold bias, and keep rear contribution predictable through a full session.
Thermal Repeatability
Ø330 mm × 25 mm two-piece vented rotor with directional vane pattern keeps stop-to-stop temperatures predictable through a session.
Race Pad Window
Open piston design without dust boots supports race pad operating ranges up to 600 °C standard or 750 °C with the Option B compound.
Serviceability
Two-piece forged construction, replaceable rotor rings, and standard race-pad shapes shorten paddock turnaround between sessions.
Vehicle-Specific Engineering
Rear bias, rotor package, bracket geometry, brake line routing, and wheel clearance are confirmed before production.
Technical Specifications & Kit Options
| Brake Caliper | ||
|---|---|---|
| Series | Racing Series — Circuit | |
| Model / Application | TR20 | |
| Axle Position | Rear | |
| Piston Count | 2-piston | |
| Piston Type | Racing pistons without dust boots | |
| Piston Diameter | 44.4 mm × 2 | |
| Caliper Dimensions | 182.3 mm × 148 mm × 71.6 mm | |
| Total Piston Area | 30.95 cm² per caliper, all pistons combined | |
| Manufacturing Process | Two-piece forged aluminum body | |
| Net Weight | 1.73 kg per caliper, without pads | |
| Surface Finish | Nickel-plated | |
| Custom Color | Not available on this caliper line | |
| Recommended Wheel Size | 17 in or larger | |
| Recommended Rotor Size | Ø330 mm × 25 mm | |
| Brake Rotor Options | ||
| Rotor Option | Standard | Option B |
| Rotor Material | Heat-treated high-carbon cast iron | Racing-grade heat-treated high-carbon cast iron |
| Axle Position | Rear | Rear |
| Rotor Dimensions | Ø330 mm × 25 mm | Ø330 mm × 25 mm |
| Construction | Two-piece rotor assembly | Two-piece rotor assembly |
| Ventilation | Internally vented | Internally vented |
| Rotor Hats | Application-specific alloy rotor hats | Application-specific alloy rotor hats |
| Rotor Mounting | Fixed or floating, depending on rotor size and vehicle application | Fixed or floating, depending on rotor size and vehicle application |
| Directional Design | Yes — left/right specific | Yes — left/right specific |
| Rotor Face Pattern | Curved slotted / Grain Slot / Wave Slot / Drilled and slotted | Wave Slot |
| Recommended Use | Steel rotor build for circuit, drift, rally, and endurance rear-axle control | Racing steel rotor build for higher peak energy events and heavier rear brake use |
| Brake Pad Options | ||
| Pad Option | Standard | Option B |
| Compatible Rotor Material | Iron / steel rotors only | Iron / steel rotors only |
| Operating Temperature Range | 0–600 °C | 0–750 °C |
| Average Friction Coefficient | μ ≈ 0.38; varies with temperature, line pressure, and rotor condition | μ ≈ 0.45; varies with temperature, line pressure, and rotor condition |
| Recommended Use | Track, drift, rally, and rear brake contribution in balanced motorsport packages | Endurance, downhill rally stages, heavy drift entries, and higher peak energy events |
| Lines, Brackets & Service | ||
| Brake Line Construction | Three-layer reinforced construction | |
| Brake Line Material | PTFE inner liner / SUS304 stainless-steel braid / PVC protective outer sheath | |
| Caliper Mounting | Radial mount with vehicle-specific caliper brackets | |
| Caliper Brackets | Vehicle-specific radial caliper brackets confirmed during the build workflow | |
| Rotor Hats | Application-specific alloy rotor hats matched to rear hub geometry and rotor offset | |
| Brake Line Fittings | Vehicle-specific; caliper-side and chassis-side fittings vary by application | |
| Wheel Clearance | 17 in wheels or larger; spoke profile is verified before production for race wheel sets | |
| Rotor Service | Two-piece rotor design allows friction ring replacement while retaining the alloy hat when serviceable | |
| Bedding-In Procedure | Required before pushing the system to race pace | |
Option B is intended for higher peak energy events — endurance, downhill rally stages, or heavy drift entries — where the standard pad would push past its window. Caliper finish is nickel-plated; color customization is not available on this caliper line.
Package List
Calipers ×2
2 × TR20 rear two-piece forged 2-piston calipers with nickel-plated finish.
Brake Pads
Brake pads for both rear calipers, selected from Standard 0–600 °C or Option B 0–750 °C compound.
Brake Rotors ×2
2 × two-piece internally vented rear rotors, Ø330 mm × 25 mm, left/right specific.
Caliper Brackets ×2
Vehicle-specific radial caliper brackets for correct rear caliper position and alignment.
Rotor Hats ×2
Application-specific alloy rotor hats matched to rear hub location and rotor offset.
Brake Hoses ×2
Three-layer stainless-steel braided rear brake lines with PTFE inner liner, SUS304 stainless-steel braid, and PVC protective outer sheath.
The Bespoke Engineering Process
Every TR20 rear racing system is engineered around the vehicle’s rear knuckle, hub location, rotor hat offset, wheel barrel, spoke clearance, brake line routing, front BBK pairing, rear bias target, axle role, and intended motorsport use. The goal is not a generic universal fit; the goal is a rear brake package that supports the front axle, holds bias, and gives the driver repeatable pedal behavior across a full session.
1. Technical Consultation
We review the vehicle, rear suspension and knuckle setup, axle role, current front brake setup, target bias, competition use, wheel package, tire compound, and whether the car uses OEM or custom rear uprights.
2. Data Submission
For OEM knuckles, provide vehicle details, current front brake setup, wheel size, wheel specs, and intended use. For custom rear uprights, provide CAD files, technical drawings, hub-face data, rotor mounting dimensions, or accurate bracket mounting-point measurements.
3. Engineering Review & Approval
TTSPORT confirms rear bias target, rotor option, pad compound, vehicle-specific caliper bracket geometry, rotor hat offset, brake line routing, and wheel clearance before the build is released.
If you are unsure whether your wheel, rear knuckle, front BBK pairing, rotor offset, brake line routing, or rear bias target is suitable, Contact us before ordering so the engineering team can review the build details.
Installation & Break-In
- Confirm vehicle, axle role, and front BBK pairing for the target rear bias.
- Verify 17 in or larger wheel fitment and spoke clearance against the TR20 caliper envelope.
- Lock bracket geometry, rotor offset, and brake line routing before production.
- TR20 rear kits ship with vehicle-specific caliper brackets, rotor hats, and braided rear lines.
- Use Standard pad and rotor specification for balanced rear contribution in circuit, drift, rally, and endurance packages.
- Use Option B for higher peak energy events where the rear brake package sees sustained heat.
- A proper bed-in procedure is required to seat the pad transfer layer before pushing the system to race pace.
Frequently Asked Questions
Is the TR20 a front or rear caliper?
The TR20 is a dedicated rear caliper — a 2-piston, 30.95 cm² platform sized to balance a larger front BBK without overbraking the rear axle.
What rotor size does it run?
Ø330 mm × 25 mm, two-piece, internally vented, directional left/right-specific. Available with standard high-carbon steel or racing-grade heat-treated steel.
What is the difference between the standard and Option B pad?
The standard pad runs 0–600 °C with μ ≈ 0.38. Option B extends the window to 0–750 °C at μ ≈ 0.45 for endurance, rally, and heavy drift work.
Will it clear my wheels?
17-inch wheels or larger are required. Spoke profile is verified against the caliper envelope during the build workflow before production starts.
Can I change the caliper color?
No. The TR20 ships nickel-plated and color customization is not offered on this race line.
Is bedding-in required?
Yes. A proper bed-in procedure is required to seat the pad transfer layer before pushing the system to race pace.
Spec Your TR20 Rear Kit
Send your vehicle, current front brake setup, wheel size, and intended use. Our engineering team will confirm rotor option, pad compound, bracket package, rotor hat offset, brake line routing, and wheel clearance before the build is released.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 2262 reviews
Sort
Product Reviews
★★★★★ 5
Great Price, Great Quality, Save your money from other over priced Brands
I absolutely love this! Just as good as any of the more expensive brands! It has great cleaning abilities and is able to get in every corner and crevice. This quality is amazing and it has a mapping feature with a remote to set it up. Powerful suction, connects to the wifi easily and has a perfect spin rate so it doesn't miss a thing! My biggest issue is that I wasn't using it as much as I should! Make sure you set up a timer and it will take care of the rest!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 8, 2025
★★★★★ 4
Growing up with robots...
I'll spare you the obvious and only mention in passing that this is obviously a Roomba-wannabee. That aside, it turns out to be a pretty good R-wbee. Which is unsurprising since I combed through a couple of different comparison YouTube videos, both of which ranked this model near the top of their lists in the category of powerful vacuum robot on a budget.
This lil sucker is indeed quite effective. I only have a carpeted bedroom, so it doesn't wander much, but it easily traverses even the bulged or steeped edges of my old burber carpeting. Like any such device, if you're going to leave it unattended, you will need to clear away any cords or other small debris (anything up to about popcorn size will just get vacuumed). I empty mine every other time I use it, and it's rarely brimming over. The only problems I've encountered have always been some kind of cordage or wire or string getting wrapped around the spinning scrubber unit--easily corrected.
I'm very happy with the remote. I tend to use it mostly as a remote controlled vacuum device; ie, me lazily stalking behind it, using the remote to reverse it or to bring it back round for a second pass, til I'm satisfied. In addition to allowing N-S-E-W directions, you can also press and hold a direction button to make it speed up. You can also toggle between carpet and hardwood mode. The device charges pretty quickly and usually lets me get 2 to 3 large room sessions completed before displaying low battery.
I will note that my kitten was a mere 3 months old when I got this device and she has literally grown up with it. It long ago stopped frightening her and now she regards this device as a friend and playmate to such an extent that I had to move the charging dock from a floor corner to a low dresser drawer--because when I left it out in the open, my cat would always manage to depress the big GO button and send it off partially charged, destined to tangle up my charging cables and neckties. So if you plan on letting your cat grow up with this robot, take precautions.
I would definitely buy another one of these, and probably will. Recommended.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 29, 2023
★★★★★ 4
Jury is still out
Size: eufy L60 SES (renewed), Size: eufy L60 SES (renewed)
I really didn't want to purchase another Eufy product. I'm very mad at them because they're security doorbell cameras failing so readily (like a hardwired doorbell that stops working and gives me the input that there's no batteries even after we had it rewired.) And I caution everyone I am not a fan of their customer service anymore.
Years ago it used to be fantastic. It is rare today, when you send in a request for help that anyone fully reads what your expressing. You get scripted answers or links to technical information that you've already told them in previous communications you've tried.
Anyway... We have a dumber, earlier version of the Eufy vacuum cleaner that is about 5 years old --recently replaced the battery because I really love how well it draws up dirt and hair... Though the little chamber constantly gets jam-packed and the machine always gets stuck. I decided to move that one upstairs and get a smarter vac (only) and looked into several that could manage pet hair and that had good mapping and the ability to avoid scooping up toys etc.
What I like is the software's easy (much friendlier than Narwal!). I think the mapping was perfect right out of the gate.
Ease of splitting out larger areas into rooms is just wonderful.
The on-screen guidance as you're using this software is mostly excellent.
I really like how you can choose a setting that the vacuum will go to recharge and re-start itself back into motion to finish the job that wasn't finished when it went kaput.
I like that you can choose the frequency of having the vacuum empty into the charging station.
These two features that I just mentioned are a little bit hidden under settings. I think tabs would be nice for some pictures like this.
I don't like that it only has one rotating brush. The older Eufy has two and I think it's a much better design to sweep things into the suction range.
I like the quiet of this vacuum. The older version was quiet and this one is quieter yet.
As a matter of fact it worries me because the difference in suction sound makes it seem as though it really isn't changing at all.
I am not so sure the suction is as effective as It's been bragged about in its right up and in other reviews... it's actually gone over places on my carpet and it really didn't pull up all the fur. (That is in the video)
I have also watched it go over small pieces of cardboard from a scratching post and it didn't pick it up... Again if the brush was there on that side it would have been pushed into the suction path better.
I am not a fan of how it seems to not know how to avoid things. When setting up and getting ready to map your home with the LIDAR, the guidance is to take everything off the floor that is possible. Of course I put things back down like the tall cat toy that that has absolute presence, no different than a small cat --and the vacuum just runs right into it and starts pushing it...Our cat food bowls and water bowls just get pushed around. And the vacuum simply runs right into any toy and doesn't bother going around any of it so I would be sure you DO NOT BUY THIS IF YOU HAVE A CAT OR DOG THAT LEAVES MESSES ON THE FLOOR!
Also on some things that were not picked up like the kitchen table, I don't get how come this vacuum just runs into it with full speed. Also it is very weird that it has a real problem transitioning to rugs. I have a leather throw rug that stays in place with people and animals going across it. But this machine's able to nose it up into the air and then get tangled in it. It means that when I have my schedule in place I have to roll up this carpet and my toilet carpets. As you can guess it's annoying.
I also found it odd that when I'm trying to have it avoid going over something I will stand in place and despite the fact that it is vacuuming according to a grid it actually came back and circled and bumped into my feet five times before it finally gave up. What if that was an animal that was standing there? Would it bump into it also?
There are reviews on here that are so much more detailed. All I can say is I tried a Roomba (returned it to store) and I tried the Narwal (The mapping was awful and I returned that one also.)
I'm simply not wanting to return another vacuum. I do want to note that I purchased this one and accidentally ordered a 'used' model which means somebody else returned it. I have a feeling it has to do with this weird occasional click click click sound that makes it sound as though something is stuck in the rollers or something to that effect.
Now that I finished muddling through this review I do know that this week I'll be getting in touch with Eufy. I can't help but wonder is this really the way this thing is supposed to be working.
Oh, I did get the setup with the vacuum bag tower. As others have said it is extremely loud. The feature that reportedly cuts cat hair also has some volume to it, but for all its noise I don't think it really cuts but maybe 50% of the hair. I still have to manually clean the roll brush frequently. See photo.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 11, 2024
★★★★★ 5
Better than my new fancy robo
Great suction power. Doesn't get stuck often. I've had this vacuum for 5 years and it still works great. We got an AirRobo with a mop feature and demoted the Eufy to the basement. But, the eufy works way better and I frequently bring it upstairs to pre-clean before the AirRobo.
Love this vacuum! Do you have a version with a mop?
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 27, 2026
★★★★★ 5
The best little helper!
Size: eufy L60 SES (renewed)
I've never owned a robot vacuum prior to this, and was somewhat curious on how it would work, and what it would really do in my small home. I got the L60 refurbished unit, and it came in a brand new box and it looked brand new when I removed it from the packaging. I charged it up, setup the app and connected it to Wi-Fi, ran a cycle and it was all so easy. It mapped my home and it is was off! It does an absolutely fantastic job. I run it daily and can notice just how much cleaner my hardwood floors are.
We have a cat who is intrigued by it, but it does a fantastic job of cleaning up the litter that is tracked from his litter box. That alone is a lifesaver. I will run it in the morning and at night in cats area to keep the hair and litter completely cleaned up.
So far I've only had a few small issues where it got stuck, twice from items left out, and once from a dirty sensor. You really need to make sure you have things put away and have the areas picked up, especially of cat toys and shoe laces, and once in a while wipe the sensors off if they get really dusty.
I highly recommend this, it truly has been a huge help just in daily pickup and keeping the house clean. Its absolutely worth the money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 25, 2026
recommand products
Aurora 476-0514-642 - J6 Repair Parts Kit 110A
2827.82
22nd Anniversary Gifts - 22nd Wedding Anniversary Gifts for Couple, 22 Year Anniversary Gifts 11oz Funny Coffee Mug for Couples, Husband, Hubby, Wife, Wifey, Her, Him, holy shit
15.99
57th Birthday Gifts for Women - 1962 Birthday Gifts for Women, 57 Years Old Birthday Gifts Coffee Mug for Mom, Wife, Friend, Sister, Her, Colleague, Coworker - 11oz
15.99
Aurora 476-0449-644 - Repair Kit 5X6X12 L
1298.81
Aurora 476-0515-644 - K6 Repair Parts Kit 110A
1755.06