Re: changing ratios

"Peter B" <[email hidden]> wrote in message
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Quoted message said:

"Mark South" <[email hidden]> wrote in message
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Quoted message said:

OTOH, if 30x32 isn't low enough then nothing is going to help.

Hows about 22 x 32 or even 22 x 34, commonplace on mtbs

I'm pretty sure that we were talking road to start with.

Quoted message said:

and yes, I do use my
22 x 32 on steep road sections, mind you I put that down to the knobbly
tyres and know that I'd fly up the same hill on my pukka road bike but
unfortunately never have it to hand to prove my assertion ;-)

I have taken my full-sus mtb out on my favourite quick road loop to compare. I
didn't use the bottom gear of 19", but I did haul up the longest hill in the
22".

On the road bike I ride that hill in the 50". I do go faster and it's more work
but the tyre and wind resistance differences seriously affect the gearing
choice.

You have got me thinking about a 12-32 cassette and long-cage mech though.

BTW for all my pedant friends out there, all numbers are approximate.
--
Mark South
Citizen of the World, Denizen of the Net
<<Tiens! Ce poulet a une grenade!>>

Mark South said:

You have got me thinking about a 12-32 cassette and long-cage mech
though.

My tourer has a 13-32 in 8 custom cassette, the chain is derailed by a
DeoreXT rear mech which is shifted by Dura Ace levers.

"Mark South" <[email hidden]> wrote in message
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Quoted message said:

"Peter B" <[email hidden]> wrote in message
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Quoted message said:

"Mark South" <[email hidden]> wrote in message
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Quoted message said:

OTOH, if 30x32 isn't low enough then nothing is going to help.

Hows about 22 x 32 or even 22 x 34, commonplace on mtbs

I'm pretty sure that we were talking road to start with.

Maybe, but is there some reason why an mtb type chainset couldn't be fitted
to a road bike?

Quoted message said:

On the road bike I ride that hill in the 50". I do go faster and it's

more work

Quoted message said:

but the tyre and wind resistance differences seriously affect the gearing
choice.

I was joking but glad to hear my assertion borne out by practical
experience.
I don't imagine wind resistance having much effect at the low speeds
associated with those kinds of ratios but would think the tyres, boingy
frame, extra weight and psychology of climbing on tarmac with an mtb would
have quite an effect.
--
Regards,
Pete

"Peter B" <[email hidden]> wrote in message
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"Mark South" <[email hidden]> wrote in message
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Quoted message said:

"Peter B" <[email hidden]> wrote in message
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Quoted message said:

"Mark South" <[email hidden]> wrote in message
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> OTOH, if 30x32 isn't low enough then nothing is going to help.

Hows about 22 x 32 or even 22 x 34, commonplace on mtbs

I'm pretty sure that we were talking road to start with.

Maybe, but is there some reason why an mtb type chainset couldn't be fitted
to a road bike?

None that I know of. The BBs are the same, but you may need a different front
mech.

Quoted message said:

Quoted message said:

On the road bike I ride that hill in the 50". I do go faster and it's

more work

Quoted message said:

but the tyre and wind resistance differences seriously affect the gearing
choice.

I was joking but glad to hear my assertion borne out by practical
experience.

It's anecdotal. Don't get me in trouble with the URC pedant patrol who will o
over me because I failed to eliminate the effects of wind speed/direction,
humidity, diet etc etc.

Quoted message said:

I don't imagine wind resistance having much effect at the low speeds
associated with those kinds of ratios but would think the tyres, boingy
frame, extra weight and psychology of climbing on tarmac with an mtb would
have quite an effect.

The tyres are a big factor, even though I pumped them up to 65psi which is much
harder than I run them offroad.

Wind resistance is significant at anything over about 10 mph. Not dominant
perhaps, but significant.

My boingly frame is a URT which is set up *properly* and my pedalling style is
smooth and high cadence. I don't bounce on either bike.

The extra weight is a pain, about 12 or 15 lbs.

The psychology is affected by the availability of much lower gears so that one
goes slower and slower, maintaining cadence by shifting down. On the road bike
one maintains cadence by getting out of the saddle at times and maintaining
forward speed.

The somewhat diffent riding position seriously affects that last choice.
--
Mark South
Citizen of the World, Denizen of the Net
<<Tiens! Ce poulet a une grenade!>>

Peter B said:

Maybe, but is there some reason why an mtb type chainset couldn't be
fitted to a road bike?

Isn't the Q factor more? i.e. you feet endup further apart.

--
Andy Morris

AndyAtJinkasDotFreeserve.Co.UK

Love this:
Put an end to Outlook Express's messy quotes
http://home.in.tum.de/~jain/software/oe-quotefix/

Peter B said:

is there some reason why an mtb type chainset couldn't be
fitted to a road bike?

<fabrizzio>Yes! You would look like a fred!</fabrizzio>

--
Guy
===
May contain traces of irony. Contents liable to settle after posting.
http://www.chapmancentral.co.uk

Victory is ours! Down with Eric the Half A Brain!

"AndyMorris" <[email hidden]> wrote in message
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Quoted message said:

Peter B said:

Maybe, but is there some reason why an mtb type chainset couldn't be
fitted to a road bike?

Isn't the Q factor more? i.e. you feet endup further apart.

By a difference of millimetres, yes, but does anyone really feel that?