"The shoulders on the front sprockets prevent using two ratios up front."
As my JT (front) sprockets had no shoulders, my use of duel front sprockets has not posed any problems. As a general statement, you will not be able to use a 12 or 13 tooth front sprocket in a "duel/duel" set-up. The reason being, the smaller sprockets do not have enough room (diameter) to have, or allow the drilling of screw holes needed for attaching the two front sprockets together. Perhaps this is what Russ meant (?). A 12 or 13 tooth sprocket is held to the primary shaft with a clip. The 14, 15...... use a plate that is held in place with two bolts (not present on 12/13 sprockets).
In my opinion, the slight misalignment on a single front, duel rear affords way more convenience as to offset the accelerated wear of a modestly priced chain and sprocket. Gerry.
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As my JT (front) sprockets had no shoulders, my use of duel front sprockets has not posed any problems. As a general statement, you will not be able to use a 12 or 13 tooth front sprocket in a "duel/duel" set-up. The reason being, the smaller sprockets do not have enough room (diameter) to have, or allow the drilling of screw holes needed for attaching the two front sprockets together. Perhaps this is what Russ meant (?). A 12 or 13 tooth sprocket is held to the primary shaft with a clip. The 14, 15...... use a plate that is held in place with two bolts (not present on 12/13 sprockets).
In my opinion, the slight misalignment on a single front, duel rear affords way more convenience as to offset the accelerated wear of a modestly priced chain and sprocket. Gerry.
