Rim Widths

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Rim Widths

Postby bianchi928 » Thu Oct 17, 2013 2:27 pm

Hi all,

I am considering some new wheels, carbon with alloy braking surfaces.

In the early stages of my investigations, I have notices some are 23mm and others 25mm.

I currently run 700 x 25 tyres on my Bontrager RXL's and do not wish to go back to 700 x 23.

Assuming the 23mm and 25mm are the rim width, could I purchase either and still run the 700 x 25 tyres or if I sell them, could you run a 700 x 23 on the 25mm (phew)

Thanks for your assistance.
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by BNA » Thu Oct 17, 2013 2:50 pm

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Re: Rim Widths

Postby biker jk » Thu Oct 17, 2013 2:50 pm

My understanding is that it's the internal rim width that matters with regard to tyre fit. So you can mount a 23mm tyre on a 25mm wide rim (internal width will be around 17-18mm). My 23mm wide tyres on 23mm wide rims measure 25mm across. So bear in mind that your 25mm wide tyres on a 25mm wide rim could measure 28mm wide so make sure you have the clearance to do it.
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Re: Rim Widths

Postby eeksll » Thu Oct 17, 2013 2:55 pm

Hopefully you can find out what tyre sizes fit the rim your buying !!! Surely the manufacturer releases some specs.

Sheldon Brown has a chart on it here
http://sheldonbrown.com/tire-sizing.html (see Width Considerations)
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Re: Rim Widths

Postby Duck! » Thu Oct 17, 2013 7:38 pm

The 23 & 25 you're referring to is the tyre width, NOT the rim width.

As biker jk points out, rims are measured between the hooks of the beads - each sidewall/bead has a P-profile facing inward, the width is measured between the opposing P's. Road rims are typically 14-17mm wide measured this way, hybrid/MTB rims 17-21mm, heavy-duty MTB rims 23+mm.
I had a thought, but it got run over as it crossed my mind.
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Re: Rim Widths

Postby bianchi928 » Thu Oct 17, 2013 9:43 pm

Thanks all.
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