Do these Dura-Ace pads perform noticably better than Ultegra pads in an "Ultegra brake set"?

There is not a noticeable difference.

Are these for carbon or aluminum rims?

Aluminum. Carbon rims need special pads. They usually come with the wheels.

I'm not sure if these are the right pads for me- the dimensions listed here , I suspect are wrong (3 in X 4 in?).

You're right, they aren't 3" x 4", maybe 3/8" by 2 1/2".

Will these fit Ultegra BR-6800 brakes?

I really don't know but why not take the old pads off and compare them to the picture? I would suggest that if your brakes are of fairly new design, they will fit.

Shimanobrake Shoes | Desertcart Austria

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Description

🚴‍♀️ Upgrade your ride with Shimano’s precision stopping power — don’t get left behind!

COMPACT PRECISION - Slim 9.5" x 5" x 1" dimensions fit perfectly within your brake system for optimal stopping power.
TRUSTED PERFORMANCE - Backed by Shimano’s legacy and a 4.7-star rating from over 680 cyclists worldwide.
LIGHTWEIGHT DURABILITY - Crafted from premium metal materials weighing just 4.54g for a perfect balance of strength and minimal weight.
SEAMLESS COMPATIBILITY - Engineered specifically for Shimano Dura Ace, Ultegra, and 105 brake systems to ensure flawless performance.
EFFORTLESS INSTALLATION - Replacement cartridges designed for quick, hassle-free swaps to keep you riding without downtime.

The SHIMANO Brake Shoes R55 C3 replacement cartridges are precision-engineered metal brake pads compatible with Shimano’s Dura Ace, Ultegra, and 105 road bike brake systems. Lightweight at just 4.54g, these durable pads offer easy installation and reliable stopping power, trusted by thousands of cyclists globally.

Specifications

ASIN	B003LHQ93G
Best Sellers Rank	#165,427 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #350 in Bike Brake Pads
Bike Type	Road Bike
Brand	SHIMANO
Brand Name	SHIMANO
Color	Black
Customer Reviews	4.7 out of 5 stars 680 Reviews
Global Trade Identification Number	00689228284876, 04524667284871, 06892280717280
Included Components	Brake Shoe and Pad
Item Dimensions L x W x H	9.5"L x 5"W x 1"H
Item Type Name	R55c3 Replacement Cartridges (pack Of 2)
Item Weight	4.54 g
Manufacturer	Shimano
Manufacturer Part Number	8FN 9809
Material	Metal
Material Type	Metal
Model Number	8FN 9809
Number of Pieces	1
Product Dimensions	9.5"L x 5"W x 1"H
UPC	689228071728 689228284876
Unit Count	1.0 Count
Warranty Description	Limited Warranty

Reviews

A**R

19.11.2025

D**E

3.05.2016

J**R

26.04.2013

M**F

5.12.2024

J**O

14.07.2025

B**G

31.10.2025

K**L

23.06.2024

V**O

11.09.2013

S**M

9.05.2024

B**B

1.07.2018

ひ**ん

10.03.2025

P**T

4.01.2019

Ｖ**Ｒ

16.07.2025

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SHIMANOBrake Shoes

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