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 Post subject: MTB Sizing
PostPosted: Sun Feb 24, 2013 9:09 am 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
Good morning all,

I am hoping someone can answer this soon, ebay awaits!!!

How do you size a MTB? ie what is the relationship between the seat tube and the size of the rider?

Thanks,

Richard


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 9:47 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Mon Apr 05, 2010 8:38 am
Posts: 2679
Location: Norfolkshire
Wowzers?? Well if it feels comfortable then it's the right size :)

But on a serious note as frame geometry varies so does the suitability of frame, I'm a tad over 6ft, 33" leg and fairly long reach, and in my collection have 18" Frame, 19" Frame, some sized as Large, one Full Susser in a Medium, I'm sure if you took all the measurements they would all vary slightly, some more than others, however all are comfortable as they are set up for me and my riding style, some have riser bars some flats some have Front rigid forks others with anything between 60mm & 100mm of Suspension Fork travel. You can roughly size against inside leg, reach and height but there are some tall riders who prefer smaller frames than to be sat on a Gate. If you can try before you buy then its a bonus but if you are doing a build from scratch then it may be a case of trial and error until you get that comfortable ride :)


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 10:13 am 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
Jussa,

This relates to a purchase on the bay. Road bikes are a bit easy - subtract 10'' from inside leg measurement (best rough guide) i am wondering if there is an easy method like the for MTB's.

But thanks - i am about your size so i know what would fit me.


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 10:49 am 
King of the Skip Monkeys
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
Posts: 26174
Location: Moomin Valley
Being 6 foot with long legs and short arms, a road bike can be as big as 60cm whereas an MTB can be as small as 17".

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.


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 10:52 am 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
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


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 10:58 am 
Retro Guru
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Joined: Sat Apr 02, 2011 11:16 am
Posts: 799
Location: Camden, London
when I bought my marin back in 1992 ISTR it was road less 3-4 inches hence I ended up with 19" frame Marin and ride 22.5-23" road but the marin does feel bit big and prefer a 17.5" in same frame now, the issue is less the seat tube as can adjust seat pin but rather the overall reach and position,

I think it rather depends on make and really endorse the comments above, it's just not that simple.......unfortunately


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 11:01 am 
Old School Grand Master
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Joined: Sat Oct 06, 2012 5:17 pm
Posts: 3775
Location: Norn Iron
Thanks for the responses, i think i understand that a rough size and mess about with seat posts should sort it out.

Thanks all, much appreciated.


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 11:36 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6979
Location: Bristle
I start from a base of 5ft10 = 18/19in and work from there


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 5:06 pm 
eBay Outing Master
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Joined: Sat Nov 21, 2009 3:53 pm
Posts: 8000
Some companies give their sizes from the centre of the crank to the centre of the seat tube..the same say 19 inch could be measured by another company centre of the crank to the top of the seat tube

Much like a road bike your looking at the two figures..frame size from where to where and the top tube length

Without showing the ebay sale..if your able to say what year and/or the manufacturer then some will be able to give you where that manufacturer measures from


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 Post subject: Re: MTB Sizing
PostPosted: Sun Feb 24, 2013 7:58 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4440
Location: Herts UK
simple rule of thumb for road bike frames is:
1/3rd height in inches
10 inch subtracted from your trouser leg length

for mtb subtract anoither 5 inches.


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