![]() The clutch wasn't that strong on some of the derailleurs, and the lack of any housing to resist the derailleur body's backwards motion during an impact exacerbated the situation further. One of the complaints that occasionally came up with SRAM's AXS Eagle drivetrains was that there was an undue amount of chainslap noise. Now the last four tooth counts are 32 - 38 - 44 - 52, which results in a less drastic change at end of the cassette compared to the 32 - 36 – 42 – 52 spread used previously. Previously, there was a 10-tooth jump from the 42 to 52 tooth ring, which was quite the leap, and left many riders wanting something in between. The adjusted gear ratios on the cassette are also welcome. The shifting performance is also noticeably better than the previous Eagle AXS drivetrains, with a much more solid feel when shifting under load. It felt dated somehow, requiring more effort and patience to make shifts compared to the rapid, positive 'chunk' that occurs with the Transmission drivetrain. I hadn't realized how accustomed I'd become to the ability to shift whenever, wherever, until I hopped back onto a bike with a 'regular' cable-actuated SRAM X01 rear derailleur. Transmission, I'd give the edge to Transmission due to the very quick, and very positive feel that accompanies each shift. The experience isn't totally identical, though, and in a head-to-head battle of Hyperglide+ vs. It's a similar experience to Shimano's Hyperglide+ drivetrains, which debuted in 2019 and also allows for shifting under load. I purposely shifted as hamfistedly as possible on a number rides, and in all instances the Transmission worked exactly as claimed. Cranking up a steep hill and need to shift to an easier gear? Go for it – the chain will pop right up into that gear without any disconcerting noises. With Transmission, there's really no reason to delay a shift. The advent of 1x drivetrains made things a whole lot easier, although in some cases you still needed to take care to avoid pedaling hard and shifting at the same time. Those were the days of front derailleurs and triple chainrings, back when there was an art to avoiding cross chaining while still finding the ideal gear. I'm going to date myself here, but I clearly remember when bike shops and magazines would publish charts that explained the ideal way to shift. The XO chain weighs 256 grams and is priced at $100 USD. Compared to the XX chain, the XO is a little heavier due to the use of solid rather than hollow pins, and it doesn't receive the extra-long lasting 'hard chrome' finish of its more expensive sibling. ![]() The XO chain has a black finish that SRAM calls 'Dark Polar', and it has a PVD (physical vapor deposition) coating to ward off corrosion and improve its lifespan. Speaking of weight, the XO cassette checks in at 382 grams, and retails for $400 USD. The 52-tooth cog is aluminum on all the casettes in order to save weight (the XX SL gets 3 aluminum cogs for even more weight savings). ![]() ![]() The cassette maintains the 10-52 tooth gear spread found on SRAM's Eagle drivetrains, but the spacing between the largest gears has been changed in order to make the jumps less drastic the final two tooth counts goes from 44 – 52, compared to 42 – 52.Īll of the cassettes in the Transmission lineup have the same architecture – the largest three cogs are pinned on, and the nine smaller cogs are machined out of one piece of steel. ![]()
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