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Old 05-15-08, 05:39 PM   #1
TulsaJohn
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Middle chainring as Outer 130/74 bcd

I am building up a touring bike and am wanting to know if I have a 130/74 bcd crank with 27/39/42chainrings and 11, 12, 14, 16, 18, 21, 24, 28, 32 cogs, will this work? I am "assuming" that if the middle and outer are both 130, it should fit. Don't know if it would goof any thing else like shifting or ???

Thanks in advance!

Last edited by TulsaJohn; 05-15-08 at 05:49 PM.
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Old 05-15-08, 05:48 PM   #2
justinb
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Why do you want 38 and 40 tooth rings on the same crank? A lot of overlapping gear ratios there.
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Old 05-15-08, 05:52 PM   #3
TulsaJohn
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Quote:
Originally Posted by justinb View Post
Why do you want 38 and 40 tooth rings on the same crank? A lot of overlapping gear ratios there.
Sorry for the edit while you responded. If you run the actual gearing table, for a 26" wheel, it is actually quite good with only the extremes overlapping.
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Old 05-15-08, 07:50 PM   #4
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A "middle" 42T, 130 mm bcd chainring will fit in the outer position but the ramps and shaped teeth that assist shifting will be on the wrong side and in the wrong positions. Physically it will work but the shifting will be compromised.
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