- Mental or the future now ? Shaft Drive
i looked at the picture and thought ‘the way they routed that cable looks crap’.Posted 6 years ago
they could have played around with the non-turn washers and routed it much more neatly. if you’re looking to put something in the public domain to promote sales, to my mind, it makes sense to get it right.
shame because the rest of the bike looks quite nice.andylMember
I quite like the idea and looked into but it is inefficient and potentially fragile (if you want light weight) and there is a problem with frame flex and keeping the gears meshed correctly. There are ways around it butwill add complexity, cost, weight etc and it will be harder to fix out on a ride.
I don’t get belt drive either. Every situation I have had belt in I hate them (racing RC cars, engine timing belts etc etcPosted 6 years agomildredMember
Done to death in motorcycling….the figures speak for themselves, a shaft drive set-up loses significantly more forces through that arrangement than a chain and sprocket system, which i believe only loses around 5% of the energy put in at the engine or pedals.
Without the normal STW sarcasm, I’d genuinely like to read studies that compare chains and shafts. I’d have thought a lightweight ‘cable’ drive, rather than solid shaft, as used on motorcycles, would be a very good alternative to the chain.
Ignoring that metals have gone up in price significantly over the past few years, I would have thought a small transfer box/diff at the BB & hub, which would then slide on a splined hub that provides the gear ratios, would be an easy proposition for a progressive engineering company. In my head its made of Ti, fully sealed, which would then reduce the need for masses of heavy lubericating oil.Posted 6 years ago
untidy for one thing, but also hangs down from the open end at the hub, which will allow water to gather, and the cable to become contaminated.Posted 6 years ago
to be fair, you’ll see it on a lot of alfine installs, but it doesn’t take much effort to do it right.
all, obviously, IMO. YMMV, etc. etc.emanuelMember
http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=10063Posted 6 years ago
I haven’t got my copy with me.I seem to recall a clean chain losing about 3%.small sprockets are quite inefficient though.small is smaller than 16.anyway.shaft drive loses much more, 15%?plus the machining has to be more precise.
it’s all there.you can find it on amazon.best cycling book ever.TandemJeremyMember
mildred – Member
I’d have thought a lightweight ‘cable’ drive, rather than solid shaft, as used on motorcycles, would be a very good alternative to the chain.
I believe the issue really is the bevel gears – you need to turn the drive thru a right angle twice – to keep it compact and light they need to be small and this is where the power gets lost.Posted 6 years ago
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