3 ms·
Chain moves side to side with gear changes, and adding extra chain tension with an extra drive sprocket could make the deraileur angry. Also, chain-tube geometr
by ryukoposting 2mo ago
Chain moves side to side with gear changes, and adding extra chain tension with an extra drive sprocket could make the deraileur angry. Also, chain-tube geometry varies a lot. Not impossible, just more complicated than it might seem.
I ride an all-original 1970s steel-frame road bike, which seems like a prime candidate for this sort of product. I'm certain no sprocket-based design would fit it. I'd buy one of these if there was any way to lock it up.
- andrewshadura 2mo agoIt does not if you use hub gears.
- Toutouxc 2mo agoYes, but a tiny minority of bikes use those, and the product is meant to go on existing bikes. Also, even on hub-geared bikes (or single-speeds) you’d still need to switch to a longer chain or significantly move the rear wheel to be able to mount the powered sprocket in the right place, so that it wouldn’t skip.
- andrewshadura 2mo agoNot a tiny minority. Depends on the country, of course, but from my experience the majority of city bikes use hub gears. And they can be retrofitted.