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Shimano Ultegra BR-6403 Brake Shoe Set
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Shimano Ultegra BR-6403 Brake Shoe Set

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Mfg PartNum: Y83G98010
rating(5 customer reviews)
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MSRP: $16.99
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Replacement Pads For Your Ultegra Caliper Rim Brakes

Gritty winter rim brake performance not quite what it used to be? Now is the perfect time to refresh those pads for renewed brake performance. Shimano Ultegra BR-6403 series brake shoes provide solid stopping power and long use for road cycling with caliper rim brakesets. Standard Shimano style non-replaceable nylon pad holders attach via hex bolt for secure rim braking.


  • Low rim-wear compound is designed for machined rims
  • Rubber/nylon construction
  • Compatible with Shimano-style caliper rim brakes
  • Attaches via hex-bolt
  • Intended use: road cycling
  • Sold as a pair, one pair per caliper. Two pairs replace both brakes
  • Weight: 52g

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.



Brake Type: Road Caliper 


Brake Pad Type: Caliper - Shimano/SRAM 


Brake Parts: Pads 


Hub Compatibility: Rim Brake 


Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Cost effective replacements
by Anonymous
2 of 3 customers found this review helpful.

While they are not exact replacents for ultegra calipers they are a good set to carry with you incase of a mishap or if someone is in trouble along the road. Good stopping power.

Reviewed 4/11/2017
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Excellent replacement
by Julian Davis
Cycling Enthusiast
West Kelowna Canada
0 of 1 customers found this review helpful.

I used these pads for a Shimano 105 brakeset on my Gardin as well as a Modolo brakeset on a Bianchi. They worked perfectly and on the old alloy 700c rims and eliminated the squeal I was getting with other pads. I would definitely use them again.

Reviewed 10/14/2021
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Great replacement breaks
by Deayne
Bay Area and Central California
3 of 4 customers found this review helpful.

I had an older pair of brake pads (Shimano 600) that I liked so I jumped at the chance to get the Shimano Ultegra's. They have performed excellently and because I do a lot of hill climbing when I descend, I feel safe with these pads.

Reviewed 4/8/2021
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Nice, but pads are not replaceable
by Anonymous
Daily Commuter
san Francisco
4 of 8 customers found this review helpful.

Bought this execting to get metal shoe with replaceable pad like Ultegra road brakes, but this a a plastic shoe with the pad glued in - works fine, but not you wil have to change the whole thing when the pad wears out.

Reviewed 5/6/2019
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Not very good on a commuter bike...
by GEA commuter
Competitive Racer
Lake Oswego
6 of 9 customers found this review helpful.

Lasted 300 miles in Oregons fall weather.

I used the pads on my single speed commuter... The fall weather in Oregon is not the greatest conditions for any brake pad... I ride pretty hard and of course brake hard too. I expected to get a little more wear out of these value pads, but they did a good job slowingstopping the bike. Might be better in summerdry conditions

Reviewed 12/29/2012
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