rear sprocket
12-22-22, 08:15 PM
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rear sprocket
hello all , merry christmas.. i'm in the process of changing my folders rear sprocket from 8 to 10 speed. currently the top sprocket is 34 tooth, i have a road bike 11-25 that i can throw on, and i can also get a 11-34 in a few days. the trigger shifter will also be here in a few days. 10 speed. the front sprocket is 48 tooth. so i guess i'm torn between which sprocket to use, i'd like to use the one i have to save a few bucks, but i'm concerned my old body won't be able to pull the hills around here with the top being only 25. would changing out the front to a smaller sprocket and using the road rear create an easier hill climbing experience? i think i have a 38 in the parts bin if thats the case. any help is appreciated. the rear deraileur is sora, by the way.
12-22-22, 09:08 PM
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48/34=1.41
38/25=1.52 or about 8% higher.
IF you could get by never using your largest cog, you'd be fine. (48/28=1.71)
If you're "strained" using your largest cog now, then no.
38/25=1.52 or about 8% higher.
IF you could get by never using your largest cog, you'd be fine. (48/28=1.71)
If you're "strained" using your largest cog now, then no.
Last edited by Bill Kapaun; 12-22-22 at 09:15 PM.
12-22-22, 09:12 PM
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Going from a 48T to a 38T front chainring is a much bigger jump than I would make. Plus, 48 X 34 will give you a lower low gear than 38 X 25, and you won't lose your high gear, since both cassettes have an 11.
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12-22-22, 10:07 PM
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There are a variety of gear calculators on the net. Any would give you a basis of comparison between what you have now and your options.
In fact, you don't even need that. You can simply divide the chainring by the rear sprocket and compare the ratios.
OTOH you already own a cassette, so you can try that for free and see how it feels. Or just for a quick no effort answer, ride thd bike limiting your shifts to the cassette sprocket nearest in size to what you propose.
In fact, you don't even need that. You can simply divide the chainring by the rear sprocket and compare the ratios.
OTOH you already own a cassette, so you can try that for free and see how it feels. Or just for a quick no effort answer, ride thd bike limiting your shifts to the cassette sprocket nearest in size to what you propose.
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