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Old 09-08-14, 11:26 AM   #1
masimix
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Crankset compability Suntour/Shimano

After I changed pedals on my GT Traffic, the right pedal detached on a ride, nothing to do, the threads were gone. Long ride home..

I hoped I could change only the crankarm, but I'm beeing told by the shop where I got it that I need the whole set new.

The crankset is Sr Suntour NRX 48/38/28 with 8-speeds in the back. PDF on the GT Traffic here: http://media.gtbicycles.com/media/t/r/traffic_30.pdf

I'm ordering some other parts from a store here in Norway, and wonder if I can use this instead: Shimano FC-171 Kranksett Sølv, 170 mm, 48/38/28, Firkantaksling - Bikeshop.no

The SR Suntour set is not available from this store (only the MTB version with 42/32/22). I Have asked the store on mail (called first), but they answered only another question regarding a roadbike.

The only difference between these two seems to be 175 (Suntour) vs. 170mm (Shimano) on the length of the arm (is there a noticable difference really?)

Thanks in advance for any light shed on this,

Marius
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Old 09-08-14, 11:50 AM   #2
fietsbob 
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Sharing the JIS square-taper standard , the crank profile is where the variation is a low profile right crank comes in to allow a shorter spindle.

a higher profile right angle arm uses a longer spindle to come out to where the crank is ..

you may need to buythe BB to match the profile of the crankset you buy ..

Talk to the seller get Both in a compatible combination .. Phone may be better to converse about it ..



175 vs 170 is just how long the arms are it may or may not matter thats up to you.
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Old 09-08-14, 12:49 PM   #3
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Quote:
Originally Posted by fietsbob View Post
Sharing the JIS square-taper standard , the crank profile is where the variation is a low profile right crank comes in to allow a shorter spindle.

a higher profile right angle arm uses a longer spindle to come out to where the crank is ..

you may need to buythe BB to match the profile of the crankset you buy ..

Talk to the seller get Both in a compatible combination .. Phone may be better to converse about it ..



175 vs 170 is just how long the arms are it may or may not matter thats up to you.

Thanks for the info on JIS vs. ISO, I'm reading on sheldonbrown.com about it.

So, it's up to the BB? I'll give them a call tomorrow about it. It only says square BB on both, pluss the Shimano has 123mm in the info window.
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Old 09-08-14, 12:56 PM   #4
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I expect the spindle is longer .. Its a Lower end crank .... but the seller is the one to confirm . spare the returns that way .
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Old 09-09-14, 05:22 AM   #5
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The threads in the crank can likely be economically repaired by installation of a Helicoil or other threaded insert.
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