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Re: why don't we have actual data on Sram axs drivetrain efficiency?

Posted: Sat Jul 13, 2024 9:05 pm
by cajer
OtterSpace wrote:
Sat Jul 13, 2024 7:12 pm
The the classified system is good for what it is. However, at a high level I currently would avoid it for road.

I mostly have worked at start up companies trying to get sold to a bigger fish and I would say as a complete outsider that classified are close to a sale if that is what they want. If you are positioning a company for a sale you want to make it look like you dont need the bigger fish and can go wide to up your evaluation. However, what really matters is the core technology which needs the big fish to really bring it to wide adoption with their larger pool of patents, resources, and established market base.

More specifically with 12s chains, cassettes, and chainrings became more of an ecosystem than before and tolerances increased due to fitting more in the same hub width. Also since STI levers launched the market wants integrated braking and shifting. These things together make aftermarket shifting parts kind of a bodge for performance 12s road. The same goes for aftermarket cassettes while they work they compromise shifting performance. Even the fast chains generally shift worse.

As a Shimano user the 10t thing is mostly a red herring. In general SRAM allows wider rear ratios with smaller front ratios which they default position for a super bailout gear by using smaller front rings. If you are worried about efficiency get bigger front rings and consider the 10t a dont spin out gear and all is good.
The TRP integration is intresting and matches what you said. I'm likley building a bike later this year or early next year. So I'll be curious to see how that and classified pans out.

Re: why don't we have actual data on Sram axs drivetrain efficiency?

Posted: Sat Jul 13, 2024 9:05 pm
by Weenie

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Re: why don't we have actual data on Sram axs drivetrain efficiency?

Posted: Sat Jul 13, 2024 9:25 pm
by apr46
One of the really interesting things about this topic is the lack of efficiency data on partly worn chains using the same lube (e.g., new, 100km, 1000km, 5000km, and 10,000km). This is really the data most of us should care about and as far as I know it doesnt exist. Given how resistant the AXS chains are to wear, one could make an assumption that they likely close the efficiency gap vs. shimano chains that wear more per km; though there are other variables involved.

Regarding chainrings. You need to watch the gap between the rings / the thickness of the spider, but I have been happy with the Praxis buzz 48/32 12spd rings paired with AXS FDs. I am tempted to swap to 50/34 rings as I might be better off with more gear on the road. I can confirm that the XCadey Gen 2 8bolt 5x110 spider has the right tab thickness to work with the Praxis rings AXS 2x. Also shoutout to Xcadey for good customer support out as I experimented with their spiders.

Re: why don't we have actual data on Sram axs drivetrain efficiency?

Posted: Tue Jul 16, 2024 1:08 am
by Lina
The chainring differences are again one of the things that people complain on the internet but it doesn't actually matter in real life. And the benefit of smaller difference is that there is less need for compensatory shifts when using the FD.