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 Post subject: 29er sizing question
PostPosted: Tue Jan 08, 2013 11:44 am 
Devout Dirtbag

Joined: Tue Feb 21, 2012 8:56 pm
Posts: 106
Location: Hadleigh. Essex
So I got myself a used 2008 Kona Unit 2-9 20" with 100mm Tora forks. Reach wise it feels good, I feel stretched out which is nice. But top tube clearance is nonexistent on stand over. I've looked at the frame size chart for that year and I suppose I could go down a size but then I would have a 110mm + stem on it just to get comfy. On the 20" I have the seat is right on the front of the rails to get my position right.

Another option is to put a rigid fork on the front which would drop it about two inches giving me some clearance. Or is it best to just get a smaller frame size with a long stem on the front?

Does anyone else ride with no stand over clearance?


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 Post subject: Re: 29er sizing question
PostPosted: Tue Jan 08, 2013 12:25 pm 
Retro Guru
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Joined: Thu May 08, 2008 4:18 pm
Posts: 2336
How tall are you? Got a pic of the bike?


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 Post subject:
PostPosted: Tue Jan 08, 2013 1:03 pm 
Devout Dirtbag

Joined: Tue Feb 21, 2012 8:56 pm
Posts: 106
Location: Hadleigh. Essex
I'm 6' 2" with a 34" inside leg. Maybe 100mm is the wrong fork for it?


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 Post subject:
PostPosted: Tue Jan 08, 2013 1:26 pm 
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Mm, doesn't look like you want anything shorter from seat to bars ;)

They originally came with a rigid fork, although it was a fairly long one to allow for a suspension swap -- I suspect they had 80mm forks in mind, but going 100->80 isn't going to make much difference to your standover. It's just unavoidably tall at the front, a lot of current 29ers have super-short head tubes to get the bars back out of orbit...


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 Post subject:
PostPosted: Tue Jan 08, 2013 4:15 pm 
Devout Dirtbag

Joined: Tue Feb 21, 2012 8:56 pm
Posts: 106
Location: Hadleigh. Essex
I know what you mean with the front feeling like it's in orbit. Feels comfy though. I'm thinking of putting a rigid fork on the front. Something like a 450mm, the current one is 510mm. So it should drop the front a bit to give me at least a little bit of stand over clearance.

Any ideas if you can get 80mm forks with a A-C measurement of 450mm? My back would appreciate something with a bit of bounce at the front.


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 Post subject:
PostPosted: Tue Jan 08, 2013 4:36 pm 
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Typical 80mm 29er forks are about 490mm static, so around 470 when riding. I suspect that's the length of the original rigid fork. I'd be wary of going really short on the fork on head angle/BB height grounds.


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 Post subject:
PostPosted: Tue Jan 08, 2013 6:12 pm 
retrobike rider
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Joined: Mon Apr 30, 2007 12:31 pm
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Location: ManchestOr
Sounds like the right size in theory, I'm the same size just still on LT 26, I expect clearance is no issue if you keep the front weighted a bit when hopping down to the floor, and running along that idea, how about wider low bars? Will the forks wind down at all?


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 Post subject:
PostPosted: Tue Jan 08, 2013 6:21 pm 
Devout Dirtbag

Joined: Tue Feb 21, 2012 8:56 pm
Posts: 106
Location: Hadleigh. Essex
That's what i thought about the size. Fits great apart from the standover clearance. Trouble is last time I went Mountain biking was about 20 years ago. Everything seems very different.

The forks are basic Tora, with no adjustment. To give me a rough idea I put a 26" in the front to see how it would feel with a lower front end with a shorter fork. I had about 2-3" of clearance. But I think I may have to swap the frame for something smaller.


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 Post subject:
PostPosted: Tue Jan 08, 2013 6:46 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Sun Sep 04, 2011 11:33 am
Posts: 3092
Location: Riding my Woodsie.
I don't have a great deal of standover on the bikes I'm comfiest on (20" Karate monkey for example. 5'11", 33"). I don't worry about it. It has never been a problem for me yet. I've found I'm either right off, or I get away with the clearance thats there. Though one ride a few month ago I did catch the stem, but that would have been the same with a smaller frame too. :lol:


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 Post subject:
PostPosted: Tue Jan 08, 2013 8:53 pm 
Devout Dirtbag

Joined: Tue Feb 21, 2012 8:56 pm
Posts: 106
Location: Hadleigh. Essex
It seems like getting the right 29er to fit seems like a bit of a lottery. Modern toptube lengths also seem quite compact compared with older frames back when I used to mountain bike regularly.

I either go for a smaller frame size with 120mm+ length stem and layback seat post or try a shorter fork on the current frame. There isn't many 29er I really like. Although I quite like the 'Karate monkey'. Maybe I'll wait and get a Krampus.

Lots to think about.


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