3 speed speedster

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RATRODER

Guest
A project I've been thinking about for some time,now that got off my lazy b**t. It is a 70cc ht run to a 22t sprocket jack shaft,then a 10t to a 22t on the hub. It needs a lot of work yet,but so far so good.Yes I know no peddles. louis
 

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srdavo

Well-Known Member
Joined
Nov 4, 2006
Messages
3,163
that is "from the ground up" awesome!!

very cool!
have you ridden it yet?
have you run it thru the gears?

I like it.:D
 
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JemmaUK

Guest
I like the style of it :)

What is the top speed with that setup?

More to the point where did you get the jackshaft from?

That would be perfect for what I have in mind which would be using a 7 speed shimano hub with a tankside shift lever and the pull start on a 48cc

Bonus is that it would fit my current Schwinn cruiser and give me a 7 speed MB :)

Jemma xx
 
Joined
Jun 10, 2008
Messages
34
the sturmey 3-speed is bomb proof and shimono and sram are getting better but I would advise staying away from the 5+ speed hubs because to say it basically the more gears you stack in the hub the thinner you have to make them and the weeker they are
 

sparky

Active Member
Joined
Mar 19, 2008
Messages
1,429
... but I would advise staying away from the 5+ speed hubs because to say it basically the more gears you stack in the hub the thinner you have to make them and the weeker they are
I was going to keep a folding bike by a brand called DownTube that came with an 8spd Sturmey, but I read some stuff about hubs with 5~7+ gears requiring professional help taking it apart & reassembling, which didn't sound any good. The stepping between gears was also pretty random... some gears that were right next to each other felt like they were the same ratio, and then the next would provide a much bigger difference. I'm sure I coulda gotten used to just using 4 or 5 of the 8 gears, but it just feels too awkward with that uneven stepping.
 
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duivendyk

Guest
The SA was sturdy but not indestructable as I had occasion to find out on the Isle of Mull in Scotland. Very inconvenient being stuck in the wrong gear.If you keep them well oiled and never ever change gears under load they are quite durable though.
 
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duivendyk

Guest
This is odd acording to the Sheldon Brown website the 8 sp S&A hub has a 28% change between 1st/2nd and 7/8th gear, the others are all around 13%. www,sheldonbrown.com
Maybe there was something amiss with your hub.I agree you don't need that many steps,as long as the total range is adequate,they were prob. trying to compete with 7 speed derailer hubs.
The 4 speed Shimano Nexus hub had around a 2.5 ratio which is plenty.I don't know if you can service them without special tools,The 8 speeds,forget it.The old 3 speed Shimano hubs were not all that hard to work on,I recall.I liked their construction better than the S&A 3 speeds (no failure prone little chain coming out of it, but a sturdy bellcrank actuator.
 
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