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.

Shimano Road Brake Pads | Desertcart UK

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Description

🚴‍♀️ Elevate Your Ride with Shimano's Ultimate Brake Pads!

EASY INSTALLATION - Quick and hassle-free setup means more time on the road and less time in the garage.
LIGHTWEIGHT DESIGN - Weighing in at just 2 pounds, these pads won't weigh you down on your cycling adventures.
YEAR ROUND RELIABILITY - Designed for all seasons, ensuring your ride is safe and smooth, no matter the weather.
DURABLE RUBBER MATERIAL - Crafted from high-quality rubber for longevity and consistent performance.
UNMATCHED STOPPING POWER - Experience superior braking performance with Shimano's precision engineering.

The SHIMANO Road Brake Pads are genuine replacement parts designed specifically for road bikes. With a sleek black finish and lightweight construction, these brake pads offer unmatched stopping power and year-round reliability, ensuring a smooth and safe ride. Easy to install and made from durable rubber, they are the perfect upgrade for any cycling enthusiast.

Specifications

ASIN	B003LHQ93G
Best Sellers Rank	#127,466 in Sporting Goods ( See Top 100 in Sporting Goods ) #758 in Bike Brakes & Parts
Bike Type	Road Bike
Brand	SHIMANO
Brand Name	SHIMANO
Color	Black
Colour	Black
Customer Reviews	4.6 out of 5 stars 638 Reviews
Global Trade Identification Number	00689228284876, 04524667284871, 06892280717280
Item Type Name	R55c3 Replacement Cartridges (pack Of 2)
Item Weight	0.01 Pounds
Manufacturer	Shimano
Manufacturer Part Number	8FN 9809
Material	Resin
Material Type	Resin
Model Number	8FN 9809
Number of Pieces	1
Number of pieces	1
UPC	689228071728 689228284876
Unit Count	2 Count

Reviews

S**M

Excellent quality for the price

9.05.2024

B**B

works great, and a great deal

1.07.2018

ひ**ん

問題なし

全く問題ありません。作業もスムーズに終わりました

10.03.2025

P**T

Ottimi

Super convenienti. Super frenata.

4.01.2019

A**R

Plug in play and good brake pads

19.11.2025

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