Actual Tire Width vs Internal Width - MTB

Discuss light weight issues concerning mountain bikes & parts.

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ipenguinking
Posts: 743
Joined: Sun Jan 09, 2005 5:14 pm
Location: Sunny So Cal

by ipenguinking

Can someone here help me to determine the actual tire width increase from 29x2.25 to 2.35, and internal width increase from 23 to 30? I'm trying to determine if there is enough clerance from switching to a new wheelset with wider internal width and mounted with bigger tire. Thanks.

darkmother
Posts: 10
Joined: Fri Nov 10, 2017 10:50 pm

by darkmother

There is a bit of variation between different tire brands/models. I've got a pair of 2.35 "Schwalbe Nobby Nic s on 30mm internal rims and the casing measures just under 60 mm at the widest part of the sidewall. I've had other 2.3 tires that are more like 63mm wide.

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Hexsense
Posts: 3270
Joined: Wed Dec 30, 2015 12:41 am
Location: USA

by Hexsense

1) The variation from tire brand/model is larger than the change in i23 to i30.
For example Aspens 2.4" on i23 will still be larger than Schwalbe 2.35 or 2.4 on i30. Specialized FastTrak/Renegade 2.35 is highly undersized even if you mount it on wide rim.

2) mtb tires need mud clearance. If there's any doubt if things will fit or not. It means you already are trying to fit a tire too big.

youngs_modulus
Posts: 668
Joined: Wed Sep 20, 2006 1:03 am
Location: Portland, OR USA

by youngs_modulus

ipenguinking wrote:
Fri Jun 09, 2023 10:07 pm
Can someone here help me to determine the actual tire width increase from 29x2.25 to 2.35, and internal width increase from 23 to 30? I'm trying to determine if there is enough clerance from switching to a new wheelset with wider internal width and mounted with bigger tire. Thanks.
I realize that this thread is a couple of months old, but I'm replying anyway.

I have a method to calculate the inflated width of a given tire as it's mounted on different-width rims. According to this method, the casing width on a 2.35"/60mm-wide tire should increase by 2.5mm.

To wit:

Code: Select all

Estimated tire width is 60.03 mm when mounted
to a rim that measures 23.00 mm internally.

Estimated tire width is 62.48 mm when mounted
to a rim that measures 30.00 mm internally.
May I ask what rims you're using? And what tire?


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