Bicycles Asked by ldmvcd on July 27, 2021
I need some advise on compatibility between the components my bicycle already has and the ones I want to upgrade to.
My current cassette and chain are worn out so I will have to replace them. I need a new shifter anyway since my current is broken. Upgrading could be fun!
Current setup – Scott Sportster 50
Upgrade option 1 – upgrade to 9sp
Cassette: Shimano CS-HG400/CS-HG201/CS-HG50 9 speed 11-32T
Upgrade option 2-upgrade to 10sp
Cassette: Shimano CS-HG500/CS-HG50/CS-HG51 10 speed 11-32T
It is assumed I will be getting a compatible 9sp/10sp chain and shifter. I want to continue with the 11-32T. The price is irrelevant.
Q1: Which above upgrade options will my derailleur work with?
Q1a: Will I need to adjust the L/H screws and B screw on the derailleur for any of the upgrade options?
Q2: Will the existing backwheel/hub take the 9sp and 10sp cassettes?
Q2b: Will I need a cassette spacer for either of them? Size?
Q3: Will the existing crankset take to the 9sp and 10sp cassette change?
Q4: If I were to go for a 11-34T cassette, would the L/H and B screws on the derailleur need to be adjusted?
Thank you! 🙂
10-speed "MTB" shifters use a different cable pull ratio. 9-speed uses the same ratio as 8 speeds. So if you downgrade to 9 speeds (downgrade since with 8 speed you have a large jump between gears so a shift results in meaningful change in gear ratio whereas with 9 speeds you need to click...click...click a lot to get a meaningful change), you don't need a new rear derailleur.
L/H/B screws shouldn't require any change because the cassette width is the same and gearing is the same too, but I would still check they are correctly set.
Spacer is only needed if you have a "road" 11-speed hub which you probably don't have.
The existing crankset will work with a narrower chain, with the caveat that if you are in big ring, little sprocket gear and then downshift in the front before downshifting in the rear, the chain can possibly "skate" over the small ring teeth shortly before engaging the small ring. It isn't reasonable to shift that way: usually you downshift in the rear few gears before downshifting in the front. The risk is small with 9 speed chain and 8 speed chainrings, and a bit larger with 10 speed chain and 8 speed chainrings.
The 11-34T cassette would require you to adjust the B screw, but so little the existing B screw position might work reasonably well.
Answered by juhist on July 27, 2021
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