Can the Crank Gear Be Replaced on a Kohler Ch20s
Originally Posted by Limablu2 
Recently bought a vintage (2001-ish) 8sp bicycle that I plan to use for touring. The triple crankset 52-42-thirty and the 11-32t cassette gives me a decent gear inch range 25-128, however I plan to travel loaded in very hilly terrain so I�d, like to bring the lower range closer to 22 inches.
Need advice please (or validation that these options are feasible) with what would work best with my 8sp Sora brifters, Sora front derailleur and wide range Deore rear derailleur combo. Each of the following would give me a 22 gear inches:
To begin, the changes you suggest will piece of work with minimal equipment replacement. The Sora front derailer is a better pick than information technology�south more expensive cousins. It�s more forgiving over a wider range. The simply adjustment you might take to make is to the bottom bracket width considering the creepo y'all advise to apply sits a broad wider than a road crank and your front shifter may not have enough range to cover that. That�s not something that is hard to change. Narrowing the bottom bracket ii to 3mm narrower will practise the flim-flam as long as the chainring don�t striking the chainstay.
1. Swap the crankset for a 48-38-26 model
This is probably the improve option. This gear chart shows the differences between your current set upwards and the new one. The 129 gear inch high on the 52/11 combination is generally useless. Seldom are y'all going to run across a state of affairs where yous really need a gear that tall. The 119� gear that 48/11 combination gives is however rather high.
2. Swap the 30t chainring for a 28t (exceeds the theoretical 22t differential) AND swap the cassette for a 11-34t
About the chain wrap, you should consider information technology more of a suggestion than a hard limit. I�m way past the limits and endure no sick effects. I�thou currently running a 44/34/20 which is a 24 tooth differential but I�ve run 48/36/twenty cranks in the by which is a 28 tooth differential without suffering from poor shifting. Here�s the gear chart for those combinations
three. Swap the 30t chainring for a 26t. Is this even possible?
It depends what the inner commodities circle bore (BCD) is. If it is 74, yous should exist able to use a 24 tooth inner. If you went that road, I�d suggest getting a 39 molar middle ring, however. Information technology would shift a little amend. Here�south the gear nautical chart for the 26 tooth inner and here�s the gear chart for the 24 tooth inner.
I would propose something entirely different, however. Go to the 44/34/22 gearing of a mountain bike triple. Here�s the chart. You reduce the high to 109� which is still a pretty skilful high gear. It�s higher than old school road bikes which had 52/14 101� gears. You get lower gear without too much trouble besides. Used mountain bicycle triples are a dime a dozen. You could even pick up an external begetting crank which are easier to install and a fleck more than robust than foursquare taper for non too much. With a little flake of surgery, you can even get down into stupidly depression gears by replacing the 22 with a 20 (with a 34 molar cassettes, that xvi� gear).
Don�t be afraid to experiment. Yous won�t intermission anything if information technology doesn�t piece of work. It but won�t piece of work. Don�t be afraid to think outside the box.
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Can the Crank Gear Be Replaced on a Kohler Ch20s UPDATED
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