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 Post subject: Cyclocross bikes.
PostPosted: Tue Jun 05, 2012 8:19 pm 
retrobike rider
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Joined: Thu Apr 17, 2008 1:24 am
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Location: Manchester
What sort of weight are they?
And what differences are there between mountain bikes? Apart from wheel size!
Do they use a road cassette?


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 Post subject:
PostPosted: Tue Jun 05, 2012 10:44 pm 
Retro Guru

Joined: Wed Jan 18, 2012 12:37 pm
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Location: Derby
Mine weighs around 20lb, but its not got amazing gear on it so could be lighter if i thew money at it.

Geometry wise more similar to a road bike than mtb, angles are a bit slacker and rear end has much more clarence for tyres and mud. The frames are a but stronger than a road frame too, and have canti bosses ofcourse.


cassette can be either mtb or road(if you use shimano ), but normally road and a road chainset with smaller rings, 39 / 44 is typical. All other gear its usually road too, even wheels. There are some specific cross parts out there but most folks just use road bits

I have seen retro mtbs used with drop bars, but they can't keep up

So really they are nothing like an mtb! More like a beefy road bike


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 Post subject:
PostPosted: Wed Jun 06, 2012 12:57 am 
retrobike rider
retrobike rider

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Thanks, what sort of thickness are the tyres? How much tread do they have?
Just thinking about building up a CX bike, don't know why, just want to!
I'll be using Raleigh Torus frame.


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 Post subject:
PostPosted: Wed Jun 06, 2012 1:04 am 
Gold Trader / rb Rider / Special
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Simlilar sizes to the biggest road tyres i believe, like 32c or whatever it is?


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 Post subject:
PostPosted: Wed Jun 06, 2012 11:57 am 
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Quote:
I'll be using Raleigh Torus frame.


That'll be a drop-bar MTB rather than a CX, then :) CX bikes have 700c wheels. I put mine together from mostly second-hand bits/things from the shed (new rims/spokes/tyres though) for really quite cheap:

Image
X0 by MikeDavis, on Flickr

Need to change the bars, though, they're not a very comfy shape really.


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 Post subject:
PostPosted: Wed Jun 06, 2012 5:23 pm 
Gold Trader / rb Rider / Special
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Some cross bike also have flat bars, so its still alot ot play with as always.


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 Post subject:
PostPosted: Wed Jun 06, 2012 5:32 pm 
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Proper 'cross bikes have drop bars :)


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 Post subject:
PostPosted: Wed Jun 06, 2012 5:41 pm 
Gold Trader / rb Rider / Special
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MikeD wrote:
Proper 'cross bikes have drop bars :)


You cant say that! Unless of course its in the regulations of the official body??


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 Post subject:
PostPosted: Wed Jun 06, 2012 5:49 pm 
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You can't use flat bars in national or international races. Even if you're not racing I don't know why you would -- you might as well just have an MTB with really thin tyres. It's the bars that make it special, in every way :)


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 Post subject:
PostPosted: Wed Jun 06, 2012 5:51 pm 
Gold Trader / rb Rider / Special
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Ohhhh i didnt know that!

Thought it would be preference really.


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