I would like to use a freewheel. I see on some other threads that there are freewheels with two gears.
If I keep the 42x18 , I would like to get as low as I can to try some more agressive trails.
I have not been on them yet so I do not know how much walking I will need to do.
Searching for an 18-20 or 21 ??? are there other sizes larger than 20or 21 with 18?
Your thoughts on this gearing?
42x21 (2:1) is still a flat land gear unless you're a real brute.
Will you put on a tensioner, or insert extra chain links to make it all fit?
I once had a 14t and 18t on my SS, the horizontal dropouts took out the chain slack. 34x14 was sortof okay on the flat road, the 18t fine for the flat cross style mud race I rode the bike up to. Shifting involved dismounting and a 15mm ring wrench.
I'm sure someone will correct me if I'm wrong but I think if you put on a 38x24 that will be an easier gear than your current 42x20 and referencing the 4 tooth rule from the singlespeed FAQ you should be able to keep the exact chain length and you won't have to adjust brakes.
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