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accidental said:
Another bike build question. I have a 49inch frame and I am 5'7" - what crank arm length should i be using? on my mtb i have 175 cranks. Also short vs long RD cage - what do i need to consider in deciding? or should i have short as i have a small frame?

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If it really is a 49" frame, it is probably too small for someone 5'7". Depends on how it is measured, etc.

Most would recommend a 170-172.5mm crank, though I don't think it makes much difference.

The length of the derailleur cage depends on the difference in your large/large chainring/rear cog and small/small. The cage has to take up the extra chain when you go to the small/small. For Shimano, a triple uses a long cage and a double crankset uses either.

These are very basic questions to be asking if you intend to buy your own build. Read and ask a lot before buying.

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