A couple of weeks ago I put a 13 tooth front sprocket on my little red donkey. I like the lower gearing, it's the same 3.00 sprocket ratio the old CT90's and CT110's had.
But I would rather go up a few teeth on the rear sprocket because small front ones wear fast. When I had the rear wheel off to change the tires I carefully measured the rear sprocket and sat down with a JT sprockets catalog and read till my eyes bled. It payed off and I found a 45 tooth rear and a 15 tooth front sprocket that fit. It's the same size sprockets the old bikes came with . No issues with clearance and I used a new D.I.D heavy duty chain, 112 links.
The bike is much more capable off road with the lower gearing, and doesn't effect the top speed except for a bit higher RPM. There is some speedometer error but I don't care, I will never be breaking any speed limit on this bike. Just my personal opinion, but these sprockets should have been standard.
But I would rather go up a few teeth on the rear sprocket because small front ones wear fast. When I had the rear wheel off to change the tires I carefully measured the rear sprocket and sat down with a JT sprockets catalog and read till my eyes bled. It payed off and I found a 45 tooth rear and a 15 tooth front sprocket that fit. It's the same size sprockets the old bikes came with . No issues with clearance and I used a new D.I.D heavy duty chain, 112 links.
The bike is much more capable off road with the lower gearing, and doesn't effect the top speed except for a bit higher RPM. There is some speedometer error but I don't care, I will never be breaking any speed limit on this bike. Just my personal opinion, but these sprockets should have been standard.
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