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Would like to know if the following Crankset is compatible?

Bicycles Asked on March 28, 2021

I have a Decathlon Rockrider 5.2 and I’m planning to replace my current crankset with a Shimano TOURNEY FC-TY501 6/7/8-speed Square Crank 48/38/28.

Would like to know if this compatible with my bike. Currently here’s what I know about the specs:

Rear Cog: 32/11 (8 speed)

Rear Derailleur: Shimano Altus Rd- ct95 8 Speed

Front Derailleur: Shimano C050 Top Swing Sis

Crankset: SR Suntour PFF 42/32/22

Top view of front crank and derailleur
Side view of front crank
Close-up of front derailleur

One Answer

FD-C050 is profiled for a 42. This degree of mismatch is usually not enough to keep it from working at all, but it's not necessarily negligible either. The tighter curve may force the FD to need to be mounted higher than ideal, which can result in inferior contact with the chain and/or gaps that allow derailment. An FD is a cheap enough part that I recommend just getting one that you know will play nice with your 48 and be done with it.

As pointed out in the comments, it's possible to run into frame clearance limitations with the bigger rings.

Total capacity is 43 on RD-CT95 so that's fine.

If the chain is sized right for your current crank, it will be too short for the new one.

SI info

Answered by Nathan Knutson on March 28, 2021

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