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GRX FC-RX600 Crankset
Shimano is often revered as a slow-moving Japanese giant and that status is a double-edged sword. On one side, it's slower to bring products to market and is often deemed to be lagging behind compared to the competition (take the burgeoning gravel scene and its lack of components for instance). On the other, you can rest assured that when the products do hit the shelves, they are engineered, designed, built, and tested to a level that ensures next-level precision and reliability. Case in point: the GRX FC-RX600 Crankset, which gives gravel junkies the option of a wider ratio double setup with typical Shimano shifting and dependability.
Shimano spent over two years getting feedback from gravel enthusiasts when developing the groupset that will ultimately tackle dirt and gravel roads and singletrack on drop-bar machines. It learned that rider's wanted the option of 1 or 2x setups, wide gear ranges, and of course, reliability. The GRX FC-RX600 gives you all this while not breaking the bank and working flawlessly with the rest of the GRX 11-speed lineup.
The crank is constructed of durable, lightweight, and stiff aluminum alloy and the 46/30t rings provide enough range for climbing long, steep grades with a week's worth of bikepacking gear without spinning out of gear on the other side. Specially engineered tooth profiles and pins ensure positive shifting even in muddy and dusty conditions.
- A crankset optimized for gravel bikes and the type of riding faced
- Wide-ratio gearing is optimized for bikepacking and multi-surface excursions
- Reliable aluminum construction withstands gravel abuse
- Cold-forged crank arms have a high strength-to-weight ratio
- Specially designed chainrings offer precise and crisp shifting
- 24mm spindle fits most bottom bracket shells
- 110/80mm 4-bolt BCD spacing increases stiffness while lowering weight
- Item #SHIU194
- Q & A
Does the job
- Familiarity: I've used it several times
The big concern I had was whether I'd spin out the 46x11 on moderately steep descents, and the answer seems to be no. So if you're not doing road rides that hammer the downhills, the 46/30 crankset (depending on your cassette) solves the gearing problem for steep dirt climbs. What keeps this from being 5 stars is that the 2.5mm offset is pointless because (and probably for most others) tire clearance is limited by my frame, not by my chainline. And because of this 2.5mm offset, Shimano says you have to use the GRX FD, so it turns out to be a more expensive solution than just replacing the crankset.
Edit: having spent more time on it, I spin out on the descents a little sooner than I'd prefer, and the obvious solution would seem to be the more expensive 48/31 GRX crankset. The additional complication is that your typical Shimano RD has a max front chainring tooth difference of 16, and the GRX crank is 17 teeth, so then you're looking at having to go with the GRX RD, which because it has a max low sprocket of 40t, means you have to ditch your 11-34 cassette and get at least an 11-40, with the wider spacing between gears. Long story short: the 46/30 is worth the trade off of better dirt climbing for worse road descending.
Finally with this 46 x 30 GRX Crankset, us fat slow old guys can actually keep the rubber down on the super steeps. When I built my gravel bike with Competitive Cyclist, I thought 'oh 50 x 34 crankset with a 11-34 cassette, perfect'. Nope. Struggled badly with road gearing riding the painfully steep Verdugo Mountains here in Glendale. With this new 46 x 30, there is hope that us mortals can get up the gnarly climbs! And the 46 is way more optimal for rollers and slightly uphill sections than the 50 ever was. I personally am not a 1x fan so this is a game changer.
Ive got an fc5800 105 crankset. Is this a direct replacement?
Will an Ultegra crank fit on here? Thinking of ability to swap in a stages PM.
Compatible with 10-speed drivetrains, correct? I thought with front chainring doubles there is no such thing as incompatibility between 10-speed and 11-speed. Thanks!
Hey John, thanks for the question. To sum up the answer, yes it will work with a 10-speed but front shifting would be affected a bit.