Ah, well there it is then. Does the cantilever have any advantage over the sidepull aside from tire width ability? How wide of a tire can your '89 take?
The cantis will give you more stopping power .
Depending on brand, 1 1/4-1 3/8. With fenders 1 1/8-1 1/4 again depending on brand and rim width. My 93 has 700x37 with room to spare without fenders