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Originally Posted by SarahB
Not necessarily, if you’re doing a multiple motor gearbox you could just combine in the gearbox, go straight to the shifter, then adjust in the chain. Doing it this way could actually be really helpful as only the smallest sprockets come in nice sized bores and you need a very large sprocket if you only want to drive the wheel(instead of the whole shaft) in your chain.
National champion team 469 used the exact same(or at least very similar) shifting design in 2003 with two motors per side without any trouble, even though the shifter was very late in the transmission.
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The torque applied depends greatly on your motor combining, and what speed they are matched at. Especially if this combiner gearbox is designed to go straight to the wheel after (as Rob mentioned). The final sprocket reduction is limited by several factors. (Such as Chain size... note: I believe "national champion team 469" blew 1/4" chain like nobodies business towards the end)
Also... I'm almost 100% positive, "national champion team 469" used a shifter NOT like Matt's, but similar to 60-2002, or 116-2002 -- where the gears slide laterally. This system is able to handle much more torque than Matt's (in which applied torque would actually try to push the shifter out of gear).
John