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 Post subject: Gear ratios
PostPosted: Thu Aug 30, 2012 1:47 am 
Dirt Disciple

Joined: Mon Jul 16, 2012 11:43 am
Posts: 72
Location: cheshire
Hi Folks,

Just wondering what to do.

I dont find it especially difficult to max out my bike, even on a small hill.

I have a 52 tooth outer chainring and my freewheel is a 6 speed 14-28tooth.

looking at the options available, it seems this is likely to be the only 6 speed freewheel i am likely to easily get my hands on.

is it possible to get say an 11-24 freewheel?

can i put a 7 speed freewheel on my bike without a new rear wheel?

or can i just get a bigger chainring? something like a 54?


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 Post subject:
PostPosted: Thu Aug 30, 2012 3:26 am 
Road Moderator
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Joined: Thu Jun 18, 2009 1:07 pm
Posts: 4715
Location: Sheppey, Kent
Cheapest and easiest option would probably be to fit a 54. Generally you can fit a 7 speed in place of a 6, the oln for both are normally 126mm.

If you have a cassette freewheel it is likely to be a Shimano Uniglide which has limited options. If it is HyperGlide then your options are wider as modern sprockets will slide on and you can create your own cassette using 7 speed spacers and new sprockets so you could have an 11-24 if you wish.


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 Post subject:
PostPosted: Thu Aug 30, 2012 9:17 am 
Dirt Disciple

Joined: Mon Jul 16, 2012 11:43 am
Posts: 72
Location: cheshire
Hi Tel,

Thanks for the reply, its a screw on freewheel and im using down tube friction shifters with plenty of movement left in them. So you think i could fit a 7 speed screw on freewheel in place of the 6?

If i can locate a 12 tooth sprocket could i just put it in and remove the 28 from the top?


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 Post subject:
PostPosted: Thu Aug 30, 2012 11:12 am 
Retro Guru

Joined: Tue Feb 23, 2010 1:56 pm
Posts: 1032
Location: West Yorkshire
I've had problems with 7 speed freewheels in place of 6 speed in that I ended up with the smallest sprocket so close to the frame that there wasn't enough clearance for the chain. With a Shimano 7 speed freewheel it was even worse because the sprocket itself fouled the frame - I think that was an MTB freewheel though.

A 13-24 six speed should be fairly easy to find - Hilary Stone usually has some Suntour ones. A 52/13 combination will give you a bigger gear than 54/14.

Moving the sprockets around on the freewheel isn't always possible depending on the manufacturer/model. Most use a combination of screw-on and splined sprockets and the body tends to increase in diameter as the sprockets get bigger. What make and model is yours?

Mark.


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 Post subject:
PostPosted: Thu Aug 30, 2012 11:16 am 
Retro Guru

Joined: Tue Jun 03, 2008 4:31 pm
Posts: 740
What are you trying to do? Go faster?
Get a 12 tooth top gear free wheel. I assume you are still on downtube type levers so you can happily bung a 7 speed freewheel on or an 8. The wheel may or may not want adjusting.


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