Changing Gear system on Folding bike

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al_yrpal
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Re: Changing Gear system on Folding bike

Postby al_yrpal » 9 Oct 2014, 12:53pm

Went out on my cheap new folder this morning and did a 22 mile ride http://bicycles4u.com/collections/20-fo ... n-explorer It has a Shimano RevoShift twist grip gear system. Obviously cheap and cheerful but it actually works fine with positive shifts without your hands having to move off the bars. This is quite important on a bike with 20" wheels because the steering is more lively. Personally, I would try the Tern out with it and reserve judgment on whether there is any need to change it. As with any new bike, and BSOs in particular it pays to lift the back wheel off the ground somehow and tinker with the rear much to align the idler wheels accurately with an appropriate sprocket and make sure that the limit stops are correctly set. Then, any ensuing noises as a result of cable stretch can be accomodated by screwing the outer sleeve adjuster out a click at a time.
I had a look at some Tern bikes in Evans Cycles and was very impressed with the quality of the parts and finish.

Al
Touring on a bicycle is a great way to explore and appreciate the countryside and towns you pass through. CTC gone but not forgotten!

Brucey
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Re: Changing Gear system on Folding bike

Postby Brucey » 9 Oct 2014, 1:44pm

if you want to learn more about bike mechanics, there is nothing like having a go yourself and seeing how you get on. However my suggestion is that you might want to think about buying a second 'project' bike to practice that kind of thing on; that way you should always have one to ride, even if things don't quite go to plan! :wink:

BTW there are such things as track nuts which have an external cam and QR lever built into them. I am however not sure that they can be had in the SA axle threading, which is unlike that on most other bike hubs. Years ago you could buy wing nuts for SA hubs and these still work OK if you have vertical dropouts. With horizontal dropouts it is difficult to get the wing nuts tight enough to entirely prevent wheel movement.

cheers
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Medic101
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Re: Changing Gear system on Folding bike

Postby Medic101 » 9 Oct 2014, 1:47pm

I have been on the bike before in fact I've spent an entire weekend riding it and I just do not like grip shifts never have and never will its just one of those things. As for a second bike I have a whole fleet of them if I need, although do need to put some electrical tape on them in key areas :lol:

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mjr
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Re: Changing Gear system on Folding bike

Postby mjr » 9 Oct 2014, 4:52pm

al_yrpal wrote:... but it actually works fine with positive shifts without your hands having to move off the bars. This is quite important on a bike with 20" wheels because the steering is more lively. ...

OK, I'll bite: except for downtube or stem shifters, what gear-changers do take your hands off the bars? Triggers and levers don't, as far as I've seen.

Downtube shifters would be exceptionally amusing acrobatics on most folders, what with their step-through frames! :lol:

al_yrpal wrote:As with any new bike, and BSOs in particular it pays to lift the back wheel off the ground somehow and tinker with the rear much to align the idler wheels accurately with an appropriate sprocket and make sure that the limit stops are correctly set. Then, any ensuing noises as a result of cable stretch can be accomodated by screwing the outer sleeve adjuster out a click at a time.

Meh, go friction and any ensuing noises can be accommodated by feeling where to leave the lever :twisted:
MJR, mostly pedalling 3-speed roadsters. KL+West Norfolk BUG incl social easy rides http://www.klwnbug.co.uk
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al_yrpal
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Re: Changing Gear system on Folding bike

Postby al_yrpal » 9 Oct 2014, 5:34pm

So sorry, obviously touched a sore point there. I do vaguely remember friction shifters back last century :twisted:

Al
Touring on a bicycle is a great way to explore and appreciate the countryside and towns you pass through. CTC gone but not forgotten!