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I'm riding 2021 Trek Dual Sport 4. It has almost full Deore groupset, except crankset. Here is the full spec list:

  • Shifter: Shimano Deore M5100, 11 speed
  • Rear derailleur: Shimano Deore M5100, long cage, Shadow Plus
  • Crank: ProWheel alloy, 42T, 175mm
  • Cassette: Shimano Deore M5100, 11-51, 11 speed
  • Chain: KMC X11, 11 speed
  • Pedal: Wellgo Black

I'm really not happy with this ProWheel crankset (from my point of view, it is unacceptable to put this noname $20 crankset to the $1200+ bike), therefore I was looking for an upgrade from day 1. As I'm utilizing this hybrid bike as intended, riding 70% ideally paved roads and 30% light trails, 42T is a must for me, so I cannot put, for example, Deore XT crankset as it's only 36T at max. Hence, I've chosen a Shimano GRX 1x11-speed crankset (FC-RX810-1 to be precise). However, I don't know if it will fit and there is no reputable bike tuner around, just a few ready-to-go bike shops. So, could you, please, help me understand if I'm fine replacing just a crankset, should I replace anything else as well or maybe consider other options for 42T?

Thanks.

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  • Please measure the bottom bracket shell width with a plastic ruler. – JoeK Mar 8 at 21:44
  • @JoeK Yes, I think this is the only correct path to follow, however, it will require a crankset disassembly. I think I'll do it on the first service. – none32 Mar 8 at 22:37
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It will be fine, as it's just a one-by ring for 11speed. You could also use a sram apex1, a miche graf, or any number of other options.

You will also need the matching bottom bracket for your chosen crank.

Fwiw, most manufacturers spec a cheaper crank, wheels and/or brakes to meet a certain price point, to avoid cheapening the frame or headline components.

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  • Thanks a lot. I do have a problem finding matching BB. My bike has BSA 73mm. I know that GRX crank requires SM-BBR60, however it is 68/70mm. Will it fit? – none32 Mar 8 at 9:58
  • Have you measured the bb shell yourself? All the ''road'' cranks require a 68mm shell so this could be a problem! @none32 – JoeK Mar 8 at 12:00
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    @none32 JoeK's comment "this could be a problem", could be reworded, "no it will not fit into a 73mm bottom bracket, you cannot use GRX, which is based on a road groupset, for your mtb derived hybrid" – Swifty Mar 8 at 15:11
  • I don't think Trek use a 73mm bottom bracket but we'll wait and see. Thanks Swifticle. @Swifty – JoeK Mar 8 at 16:45
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    @JoeK Strange... If you'll go to FAQ section here on official Trek website trekbikes.com/us/en_US/bikes/hybrid-bikes/dual-sport-bikes/… you will see that they are saying and I quote: "DS will use a 73 mm BSA bottom bracket". – none32 Mar 8 at 22:34

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