I Have RH 38 MM Barlow pass & 35 mm Bon Jovi pass endurance casing on Campy 
proton rims 18 mm wide
They measure spot on

RH 32 mm measure 29 mm on campy neutrons,  but RH tells you on the website they 
will measure 29mm


BTW the only tires I have ever had that measure as advertised

From: rbw-owners-bunch@googlegroups.com <rbw-owners-bunch@googlegroups.com> On 
Behalf Of Father of Sam
Sent: Friday, December 13, 2024 11:12 PM
To: RBW Owners Bunch <rbw-owners-bunch@googlegroups.com>
Subject: [RBW] Re: Rene Herse Tire Actual Width

Hi Oliver,

You may have heard enough already, but I thought I'd throw my 2 cents in:

I've had 4 different models of RH tires mounted solely on Velocity Cliffhanger 
rims (700c and 650B with an IW of 25mm), and all have measured exactly as the 
label on their sidewalls indicate.  Cliffhangers are about as wide a rimbrake 
capable rim as you'll find. My guess is that the manufacturer would rather 
overshoot on the label than undershoot, as ultimately the width of the rim 
dictates the actual mounted tire width.  If RH were labeling their widths 
according to a median instead of a maximum rim width (say, 19 or 20mm), then 
the Hatcher Pass might be labeled 700 x 44 instead of 700 x 48.  If they're 
labeled as 44mm wide, and I've carefully measured the clearance between my 
chainstays as 48mm, then I would buy these Hatcher Pass tires expecting that 
they would have as perfect (IMO) 2mm of clearance on each side.  But then, lo 
and behold, I mount them on my Cliffhanger rims, and I'm left with a wheel 
whose tire rubs the chainstays and I'm mumbling curses under my breath.

Makes sense to me that stated width errs on the larger side. Hopefully that 
lends a little peace of mind.

FWIW,
Peter

On Thursday, December 12, 2024 at 9:34:26 PM UTC-8 Oliver Moss wrote:
I've picked up a few different widths of RH 650b tires used and noticed that 
they are consistently under the listed width by about 3-5mm. On the RH website 
they list the approximate "actual" width with certain given rim IDs, and I've 
noticed the ones I've gotten to be under.

The two rim IDs i've used are 17mm and 21.6mm

As an example, I'm running a set of Babyshoe Pass 42s on 17mm ID and they are 
measuring 38mm

None of this is really too much of a deal as they are great tires and I really 
enjoy riding on them, but I wondered what other's have noticed in terms of 
actual width. Of course I know it all depends on the rim and tire... ect. but 
it was something I noticed and thought I'd ask if anyone else had the same 
experience.

Cheers,

~Oliver
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