SRAM 10t AXS cassettes

Equipment
1

Looking at the new cassettes in AXS groupsets (not to buy just nerding out) and they are now running 10t smallest cog with corresponding smaller chainsets.

Why have they gone smaller all round when companies like Ceramic Speed make larger jockey wheels, and all the top TT riders are running larger rings to reduce the chain wrap angle (easiest way I can describe it) which reduces friction (or so their studies suggest).

Seems the two ideas are moving in diametrically opposite directions, I would have thought what it would have been better to go larger since on most UCI bikes you’re nudging the weight limit anyhow so a few extra grams in chainrings wouldn’t matter. Would also mean anyone with an 11-speed freehub could drop a 12-speed cassette on and adjust chain rings accordingly for a cheaper upgrade route.

2

There is a fair bit of discussion on the 10t concept and execution in this thread.

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3

10t is nothing new and has been around for years now.

4

The 10t has been in use from SRAM since the introduction of the 1x11 systems, but that was MTB focused.

Aside from a few people making frankenbikes, the AXS 10t for a road bike application IS effectively new. (In reading between the lines of the OP, I am guessing his focus is on the road side). As such, the application and concerns for road use may well vary compared to the prior MTB use.

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5

On the TimeTrialling Podcast today, the guy behind PCD chainrings mentions hearing that CeramicSpeed found 6W difference in efficiency between a 48x10 and a 53x11 in favour of the 53. I’m not sure why SRAM are pushing smaller rings.

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6

That’s what I was wondering, maybe when 3rd party cassettes are available someone will be able to test identical ratios with 10t and 13t cogs.

7

Probably due to the fact that most people are pushing gears that are too hard from then. I see many people grinding away and struggling up climbs when it would be much easier in a smaller gear.

8

I see this a lot for the casual bike rider and want to scream “SHIFT!” when they’re not in the easiest gear. Can’t say the same for those that can afford AXS I’ve been around. By that I also mean people that have gear ratios to suit the demands in terms of desired target power.

9

Maybe this was the reference. Odd though all variables weren’t kept the same to compare the gear and ring sizes only. They instead compared Sram vs Shimano, complete package. Take from it what you will.