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Posted 20 hours ago

SHIMANO FC-RX600 GRX chainset 46/30, double, 11-speed, 2 piece design

£14.975£29.95Clearance
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About this deal

With its mountain-bike-like 96mm bolt circle diameter (BCD) for tiddly 11-speed chainrings, Miche's Graff subcompact chainset offers super-low gearing. It's just what gravel bikes need, but roadies on well-loaded bikes, beginners, and lovers of seriously steep climbs will find much to enjoy as well. It's a little heavy and basic, but the Graff is a no-nonsense route to meaningful gearing change at an attractive price.

SRAM has launched a 12-speed mountain bike groupset to overcome the problem of the gappy cassette, but in Bellin's opinion "a super compact is a good way to keep your 10-speed gruppo but still climb long-distance mountains.” But we think they have a place for general riding too. As soon as you hit seriously hilly terrain, there's going to come a moment when you need the lowest gear you can get. You might have blown up, you might have hit a 20% grade or steeper. Options like FSA's Adventure series cranks, Sugino's OS cranks, or the Praxis Works 48/32 cranks give you a slightly lower gear range for those situations. BCD (bolt circle diameter) is the diameter of the circle that intersects the centre of the chainring bolts. Ben Delaney / Our Media SRAM therefore offers chainring combinations of 46/33, 48/35, and 50/37, plus the Force Wide system has a 43/30 crankset.The 53/39 chainset is now a rarity outside the professional peloton. The last bike we tested that came equipped with one was in 2017, so we should probably stop calling it a standard crankset, because it isn't. There's apparently a further need for speed among the pros though, because Shimano offers a 54/40 option on the latest Dura-Ace Di2 groupset. That's because, of course, pro cycling is much cleaner these days and without performance-enhancing drugs everyone has slowed down. Yup. Ah-huh.

Swapping chainring sizes is possible, but compatibility needs to be considered. Simon von Bromley / Immediate Media Praxis Works make a 48/32 sub compact chainring set on a 110bcd, which means you don't need to buy a specific sub compact chainset. The inner mounts on the outer, as it's the BCD that dictates the smallest size inner chainring possible.It’s even more complex because there are different standards within both mountain bike groupsets and road groupsets. Some are inter-compatible, most aren’t, although you can buy adaptors for some combinations.

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