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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 8:31 pm 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
o2,

Super job, that is the sorta thing i understand.

Thanks,

Richard


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 8:36 pm 
Retro Guru
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Joined: Tue Aug 07, 2007 12:22 pm
Posts: 2942
Location: Platsa, Messinias, Greece
TGR wrote:
Is the measurement of the seat tube different then from a road bike? I am trying to work out a size for a frame for my mate. He is 5'9'' with inside leg of 30''. What would this equate to in MTB frame size?

Or, will almost any frame do - just with a scaffolding pole for a seat post when required?

Thanks Mr Large Cheese

16/17" inch centre/top with an ETT of around 23" would seem about right to me. That and a 70mm stem probably.


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 8:37 pm 
Gold Trader
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Joined: Wed Apr 25, 2012 10:36 am
Posts: 5226
Location: High on a hill above the Somerset Levels...
In Ye Olden Days, we were taught - inch clearance over top tube for a road bike, and at least 3 inches for a MTB. But obviously road bikes tend to be more sloping TT nowadays, and the same for most MTBs. Comes down to what the others have said in reality, re. inside leg measurement, minus so many inches...

Not sure that helps at all unless you have the bike in front of you :?


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 8:41 pm 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
That is great, it gives me some idea what i am looking at. I hope to get 2 frames for £10 and i thought they might be super small but it seems not.

Thanks for all the advice! I better return to Retro Road before I get stuck in the Darkside!!!!!


Thanks all (yet again),

Richard


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 11:20 pm 
Old School Grand Master
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Joined: Sun Sep 05, 2010 1:10 am
Posts: 4756
Location: Heathfield, East Sussex
If you check out my bikes in the links below you'll see how I like to set mine up...

...I'm 6'1 and my frames are all 18" or 19" (with the odd 17" thrown in for good measure!).

I'm the opposite to LGF; I have short legs for my height and long arms. The stem on my cro-mega is 160mm :shock:

I can set my seat height to within a few mm before I even try it; I stand next to the bike and tuck the seat into my hip, and nine times out of ten that's all the adjustment it needs... 8)


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 11:22 pm 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
Thanks for that. Why do i think i am getting sucked into the Darkside?

Thanks for all the help chaps and chapesses, it is really appreciated.

Richard


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 Post subject: Re: MTB Sizing
PostPosted: Mon Feb 25, 2013 12:58 pm 
retrobike rider
retrobike rider

Joined: Sun Sep 23, 2007 11:22 pm
Posts: 7306
Location: Hove
legrandefromage wrote:
Its very easy to make MTBs fit due to the number of different stems available, add a long seatpost and you have a lightweight chuckable trail machine.

I very rarely see advice from you that I disagree with LGF, but I have to disagree here. Steering characteristics are very sensitive to stem length, so I would suggest that stem length should never be used to make a bike fit. And especially a longer stem should never be used to make a frame that is too small 'fit'. I wouldn't want a bike that 'fits' if the downside was that it had unresponsive steering.

If the OP is looking to advise a friend whose leg length is slightly short in relation to his height, that argues for a larger size frame with a sloping top tube. He must have a long upper body in relation to his legs, so a larger frame would give him a long top tube to suit his long upper body. He could set the seat lower for his shortish legs and a sloping top tube would prevent the standover being too high.


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 Post subject: Re: MTB Sizing
PostPosted: Mon Feb 25, 2013 1:13 pm 
MacRetro rider
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Joined: Sat May 22, 2010 7:25 pm
Posts: 4977
Location: Edinburgh
We_are_Stevo wrote:
I can set my seat height to within a few mm before I even try it; I stand next to the bike and tuck the seat into my hip, and nine times out of ten that's all the adjustment it needs... 8)


I set my bikes up height wise by standing over the top tube and adjusting the saddle until the nose of the saddle is touching the bottom of my coccyx and it is right for me.

I don't mind a frame that is a little too large or small as long as the top tube is the right length for me.


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 Post subject: Re: MTB Sizing
PostPosted: Mon Feb 25, 2013 1:19 pm 
retrobike rider
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Joined: Tue Jul 10, 2012 11:58 pm
Posts: 2362
Location: Bournemouth
Richard, is this for a "friend" or you? ;)


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 Post subject: Re: MTB Sizing
PostPosted: Mon Feb 25, 2013 6:38 pm 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
Ha ha Tim,

Defo my mate!!!! LOL

'My friend' is much bigger width-wise but shorter - LOL.

Thanks all,

Richard


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