Motorcycle Repair/Chain size


1963 honda c105 trail 55, needs a chain. The original is missing. I am interested in using the small sprocket. I need all pertinent information to aquire a chain please. If you have information on the large sprocket. That may also be helpful.....Thanks,AND KEEP SMILING


Here are images of the rear sprocket options from Honda... for chain part numbers, but translating the OEM numbers to DID or RK parts shows the chain pitch to be 420 size. Length depends upon the front and rear sprocket choices. Stock length appears to be 100 links.

Bill Silver

Motorcycle Repair

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Bill Silver


Need help with vintage Hondas from the 1960s? I am an expert with 250-305cc bikes in particular and most all of the other pre-91 models, in general. I do NOT claim to have a great deal of experience on Gold Wings, Cruisers, ATC/ATVs and dirt bikes.


I have owned/ridden/maintained Honda motorcycles for 35 years. I have written five books on Honda repairs and collecting. I was a service manager for two Honda shops back in the 1980s.

VJMC (Vintage Japanese Motorcycle Club) of North America

VJMC newsletter, as editor for two years and as contributing editor currently.

3 years auto shop in high school, teacher's aide in Automotive Technology in Jr. College, Diesel mechanic course in college, self-taught mechanic and automotive writer.

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