Some lower gears

General cycling advice ( NOT technical ! )
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al_yrpal
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Some lower gears

Postby al_yrpal » 10 Apr 2012, 3:02pm

My recently inherited Mercian really flies, except on really big hills where I have actually had to get off and push. It has a 9 speed Campag Veloce groupset with 52 42 on 135mm bcd and a cassette ending in 26. Giving me a lowest gear of 44".

With my aged legs I am wondering how to get easier gears. I think I could fit a 39 tooth chainring and up the cassete to 28. Looking at the derrailier I think it will possible clear but I am not sure? Then, I could go for a compact, which I cannot find anywhere, it might give me a small chainring size of 34 and again 28 rear, which would help.

Mick said get a triple, but 9 speed Veloce triples seem as rare as hens teeth. I gather you have to replace the BB too?

I am wondering about just fitting a Stronglight Impact triple chainset or a Shimano Dora or Tiagra triple but don't know if these are compatible with the shifters front derrailier and chain?

Can anyone suggest a solution that would give me a 30" lowest gear and that doesn't cost too much?

Al
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ANTONISH
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Re: Some lower gears

Postby ANTONISH » 10 Apr 2012, 4:18pm

I think Spa cycles offer an adaptor ring which would enable you to convert your double into a triple.

pete75
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Re: Some lower gears

Postby pete75 » 10 Apr 2012, 4:52pm

A centaur from bike plus is just 40 quid and they do the right veloce BB for another 15. http://www.bikeplus.co.uk/products.php? ... etail=true
or if you're feeling flush a record triple from the same place for 80 quid http://www.bikeplus.co.uk/products.php? ... etail=true
Alternatively this Miche from Spa is very close to a Campag design http://www.spacycles.co.uk/products.php ... 0s109p2690

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531colin
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Re: Some lower gears

Postby 531colin » 10 Apr 2012, 6:20pm

Gears aren't my specialist subject, but won't Al. need a long cage mech. for a triple?
The adapter rings are OK in their way, but if the inner ring of the double seats on a shoulder on the spider, you have to grind the shoulder off to use the adapter ring, and you will probably need a longer BB as well.
Doesn't Ayesha (sp?) use a super compact double (Alpine double?) using the inner and middle ring spaces of a 110/74BCD triple?

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cycleruk
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Re: Some lower gears

Postby cycleruk » 10 Apr 2012, 9:43pm

Going to a triple usually requires:-
Chainset, of course.
Matching bottom bracket.
New front derailleur.
Longer cage rear mech'.

Easiest option would be a compact 50/34 chainset. I would assume that you can use the existing BB?
The only problem could be the front mech' but I would try your current one first.
(Front mech's are designed to work over a difference of teeth between the chainrings. ie A 50/34 obviously will require a front mech' range of 16.)
I would also assume that your rear mech' will work with a 53/39 chainset so should handle the 50/34 version, but the chain length may need altering?
If deciding to use the compact then I would try it with your current cassette and see how you get on with that. But as you say there are cassettes with a 28T sprocket (12-28 or 13-28).

But some people, me included, prefer a triple to the "compact" double.
With my compact I seem to be changing gears a lot because of the big jump between the 50 and 34 rings.
Mine is on a 10 speed cassette and you can change as many as 5 sprockets when changing between the chainrings. :?
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al_yrpal
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Re: Some lower gears

Postby al_yrpal » 11 Apr 2012, 10:36am

Many thanks to all for the advice.

Al
Touring on a bicycle is a great way to explore and appreciate the countryside and towns you pass through. What do you do to make a difference?

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Mick F
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Re: Some lower gears

Postby Mick F » 11 Apr 2012, 12:39pm

531colin wrote:...... won't Al. need a long cage mech. for a triple?
No, not if he stays with Campag.

Campag go down to 30t front and 29t rear, and up to 53t front and 12t rear. That range fits quite nicely with a Medium.

If you want a wider setup Campag Long is available, but it won't cope with anything bigger than a 29t rear. Maybe you could get a 30t to work, but I don't know. If you want to go bigger than 30t, Campag isn't for you.
Mick F. Cornwall

GavinC
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Re: Some lower gears

Postby GavinC » 11 Apr 2012, 1:13pm

ISTR that for the Mirage/Veloce/Centaur 9 speed, Campag specified that the same 111mm bottom bracket could be used for double or triple chainsets. You only need the longer 115mm BB to fit a triple to frames with oversize tubes.

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Steve Kish
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Re: Some lower gears

Postby Steve Kish » 11 Apr 2012, 8:53pm

A nice Stronglight Impact chainset with a 110mm BCD will allow a 34T inner ring. :D IIRC, Spa Cycles are practically throwing the cranks away at about £30 a pair.
Old enough to know better but too young to care.

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al_yrpal
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Re: Some lower gears

Postby al_yrpal » 11 Apr 2012, 11:20pm

Steve Kish wrote:A nice Stronglight Impact chainset with a 110mm BCD will allow a 34T inner ring. :D IIRC, Spa Cycles are practically throwing the cranks away at about £30 a pair.


Thanks Steve

But, can you use this with a Campag chain and Campag front shifter and Campag chain? From what Mick says the Campag rear mech will handle it?

Al
Touring on a bicycle is a great way to explore and appreciate the countryside and towns you pass through. What do you do to make a difference?

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531colin
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Re: Some lower gears

Postby 531colin » 12 Apr 2012, 8:32am

al_yrpal wrote:......But, can you use this with a Campag chain ............ and Campag chain? .....


Not both at once Al......... :wink:

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531colin
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Re: Some lower gears

Postby 531colin » 12 Apr 2012, 8:37am


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al_yrpal
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Re: Some lower gears

Postby al_yrpal » 19 Apr 2012, 8:41pm

In the end...

I put a wanted ad on this forum for a Veloce triple and triple mech expecting to be disappointed, but....

Tel came up with a s/h one, a mech and a BB at a very reasonable price

Arrived promptly today, so I fitted them this afternoon - absolutely perfect - delighted!

I now have a 32" lowest gear instead of 44". Should get me up any local hill on this lovely old sub 11kg bike.

Mystery is, Campag chain - looked at it and couldn't find any way of splitting it without using a chain splitter???.. but didn't need to. Do you buy these ready joined or what?

Al

Thanks once again for all the helpful advice
Touring on a bicycle is a great way to explore and appreciate the countryside and towns you pass through. What do you do to make a difference?

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cycleruk
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Re: Some lower gears

Postby cycleruk » 19 Apr 2012, 9:49pm

No the chain is not ready joined.
Wouldn't go through the chainstay if it was. :mrgreen:
I use quick links for all my chains now.
http://www.ribblecycles.co.uk/sp/road-t ... 0000000000
Or other makers equivalents.
There's no such thing as a tailwind.
It's either a headwind, or you're going well.

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RickH
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Re: Some lower gears

Postby RickH » 19 Apr 2012, 10:27pm

I've been using Wippermann Connex chains for a few years. They come with a quick link that lets you split/join it without tools, even after extended use.

The stainless version seems to be pretty good at surviving my lack of tlc over winter use pretty well too.

Rick.