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Your cart is empty.BR-R451 Road Brake Calipers Features-Adjustable toe-in brake shoes-Use of these calipers with standard SLR enabled STI and brake levers results in a "mushy" brake response-Compatible with STI and brake levers that are Super SLR enabled (e.g. Dura Ace Di2 7970, Dura Ace 7900, Ultegra Di2 6770, Ultegra 6700, 105 5700, Tiagra 4600)-Light action and accurate brake power Item Specifications-Brake Lever Actuation:Short Pull Super SLR-Defined Color:Silver-Brake Mount Type:Mid Reach Caliper (47mm - 57mm)-Pad Type:Cartridge-Brake Position:Rear
Pork Chop
Reviewed in the United States on August 18, 2023
Shimanao makes really quality dual pivot brakes. These are medium cage so they will work on lots of the older bikes also. I used it on a 20 some year old Surly pacer road bike.
Festus Necrogums
Reviewed in the United States on July 24, 2023
Bought this to replace a 2011 Shimano 105 caliper that had finally worn. This caliper is identical in design, and works great. It's heavier, but if would rather save a few dollars than a few grams, you can't go wrong.
Soichiro
Reviewed in the United States on May 13, 2023
I purchased this Shimano brake (got the front one at the same time) to replace the calipers on my 2009 road bicycle, which came with Dia-Compe BRS 101 caliper brakes. Both these brakes are mid-reach - Shimano 47-57mm and Dia-compe 43-57mm. The original brake lever/caliper always felt soft (mushy) and not crisp. I changed the levers but felt the same, so I decided to purchase this Shimano calipers which are much beefier and has matte finish, which happen to match my other components. The difference between Dia-compe and Shimano is very clear - unlike Dia-compe's soft feel, Shimano brakes are much more responsive, likely due to rigid brake arms. Keep in mind that, I am comparing with the old, used brakes with brand new ones, so I am sure that is a part of it, but I am pretty happy with the purchase.
WAB
Reviewed in the United States on November 23, 2023
I’m converting an old 700c bike into a 650b bike to fit as I age. This is the only rear brake that fits for this purpose.
Easy install. Works great. Happy I bought it.
Reviewed in the United States on April 21, 2023
One of the best buys I ever made on Amazon. Easy install. Works great at stopping my bike.
wayne taylor
Reviewed in the United States on October 26, 2018
Replaced the brakes I have had on my bike for a number of years. Very happy so far.
John P.
Reviewed in the United States on July 19, 2016
Nice quality construction. I gave it 5 stars even though I couldn't use it on my bike. My fault - I should have read the Q&A section before ordering. I converted a 1975 Schwinn Le Tour to a fixie with 700cm rims. In this configuration, the rear caliper needs a loooong reach. Had to go with a Tektro long reach unit instead. Make sure you measure your bike before ordering, because there are long reach calipers and really long reach calipers. Included a photo of my rear caliper to illustrate the reach measurement.EDIT: Max reach on the Shimano R451 is about 57mm. Max reach on the Tektro R559 extra long reach is about 82mm (As measured by me. Manufacturer's spec is 72mm.)
Steph
Reviewed in the United States on August 10, 2014
A year or so ago I bought a Giordano Libero bike because I wasn't ready to make the investment in a more expensive bike (mainly because I wasn't sure how much I was going to use it). Turns out I used it a lot, but there was a few things I needed to upgrade to make it less infuriating to ride. The main thing was the brake calipers. I searched far and wide for something that would fit (and those shorter-reach calipers that apparently everyone is using just wouldn't reach far enough. ) Finally I found these. FINALLY something fit. My ride has changed so much, I can finally brake from the hoods without feeling link my hand is going to snap in half. I also ride a four-mile 2,000 ft elevation gain ride frequently, I used to have to stop half-way down to give my hands a rest. Not anymore. I can go straight down and straight up. Definitely worth the investment. Easy to install and adjust. If you're installing this on a Giordano Libero you will probably have to do what I did - bore out the existing hole for the caliper just a little bit - it wasn't quite big enough.
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