Check if the chain can shift to the smaller sprocket. Some times in old frames the drive side seat stay is not flattened where it meets the dropout. With 7 or 8 speed is fine as smaller sprocket is not that close to the dropout but when you install a cassette with more gears, this can be an issue.
Check if the chain can shift to the smaller sprocket. Some times in old frames the drive side seat stay is not flattened where it meets the dropout. With 7 or 8 speed is fine as smaller sprocket is not that close to the dropout but when you install a cassette with more gears, this can be an issue.