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Replacing Old Suntour XCM Crankset

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Replacing Old Suntour XCM Crankset

Old 04-16-22, 05:54 PM
  #1  
RandomlyWest
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Replacing Old Suntour XCM Crankset

Hi, I have a 1989 Schwinn Impact MTB, and a very experienced mechanic who's worked on bikes for 30+ years tells me it's time to replace the crankset. I want to keep the vintage "silver" look.

Can I replace my old Suntour XCM 170mm 48-38-28 triple with either
  • a new Stronglight 170mm 48-38-28 or
  • a new Sugino XD2-500T 170mm 48-36-26?
No issues if I do this, right?
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Old 04-16-22, 06:15 PM
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Do you need the whole crankset or just rings? Rings might be cheaper.
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Old 04-16-22, 06:49 PM
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Whole crankset.
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Old 04-16-22, 09:06 PM
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Chain line might shift and sometimes a spec BB will be needed. Andy
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Old 04-17-22, 05:03 PM
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Thanks so much!
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Old 04-18-22, 04:27 AM
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Originally Posted by RandomlyWest
Whole crankset.
Why the whole crank? are the pedal threads or BB taper damaged?
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Old 04-18-22, 05:50 AM
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Originally Posted by jimc101
Why the whole crank? are the pedal threads or BB taper damaged?
Possibly rivet rings?
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Old 04-18-22, 07:27 PM
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My mechanic referred to bearings, so yes, maybe the BB taper.
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Old 04-18-22, 07:47 PM
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At our bike Co-op, we sell replacement bottom bracket spindles and a complement of balls for $5. For someone good, refreshing the bottom bracket is a 30 minute job. In the unlikely event that the cups are pitted, that would cost you another $5.
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Old 04-19-22, 05:54 AM
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Originally Posted by RandomlyWest
My mechanic referred to bearings, so yes, maybe the BB taper.
If it is the bearings, it’s simple to replace the bottom bracket and keep the crankset. But maybe there’s more to the story if an experienced mechanic recommended a new crankset too.
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