SR-Semi-pro fricton to index shifting
07-31-08, 05:14 PM
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SR-Semi-pro fricton to index shifting
need some help!
I have an '80's SR semi-pro, has full Suntour/SR everything...I'm tired of the friction shifters and want to go to index shifting. I bought a set of Suntour GPX shifters/front & rear derailluers to do the upgrade. Now I hearing I need to upgrade the cassette to be compatible as well? I want to keep it a six speed...what the best solution? PowerFlo or ??? the hubs are Suntour sealed bearing units.
I have an '80's SR semi-pro, has full Suntour/SR everything...I'm tired of the friction shifters and want to go to index shifting. I bought a set of Suntour GPX shifters/front & rear derailluers to do the upgrade. Now I hearing I need to upgrade the cassette to be compatible as well? I want to keep it a six speed...what the best solution? PowerFlo or ??? the hubs are Suntour sealed bearing units.
07-31-08, 05:19 PM
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Was gpx a 6 speed group? Their center to center spacing differed btwn 6 and 7. I think that should be 7 speed, but really I'm only guessing. If so any suntour 7 speed freewheel or cassette- whichever it is- should work... I think. I think the spacing became standardized w/ 7 and 8.
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07-31-08, 05:55 PM
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the shifters are 6 & 7 speed index compatiable as well as friction. Do I have to have a indexing cassette that has the special teeth specifically for indexing?
07-31-08, 06:47 PM
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It's not the teeth, it's the spacing between the cogs. I'd ask in the classics area, more working knowledge in there of suntour indexing probably. Personally it confuses me.
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08-01-08, 01:44 AM
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For cog spacing, see-
https://www.sheldonbrown.com/gloss_sp-ss.html#spacingk7
https://www.sheldonbrown.com/gloss_sp-ss.html#spacingk7
08-01-08, 04:53 PM
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The stuff you have should index with any Suntour 6-speed freewheel except an ultra-6 spaced one. If your FW is ultra-6 spacing, the shifters may index OK on 7-speed setting (just ignore the extra click).
08-01-08, 05:28 PM
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So is suntour's freewheel spacing before they had indexing the same spacing as after in general exceot when it comes to certain accushift systems?
See I had an xcd6000 drivetrain once, 6 speed indexed, and it only took a 6 speed accushift freewheel which was different than a standard 6 freewheel.
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08-08-08, 04:09 PM
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So i just gave up...went to a shop had them install and adjust...i works just fine. Sometimes to much information from to many sources gets screwy...when in doubt, trying it out.
