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Discussion Starter · #1 ·
Quick Q - I just built up a new bike (Reeb Dykeluos 2.0) singlespeed and am rolling on i9 hubs laced to Ibis 942's (29" / 42mm Internal) with Bontrager XR4 2.6" tires...fat curious, but not quite and XC+ tires.
She's a singlespeed, so maximum grip when climbing is important...

I am coming from some pinner Roval 28mm internal wheels and was running 18psi in back and around 20 in front...

With the wider rims and tires, I have been experimenting with dropping the tire pressure...not much of a fat biker, and not really tuned in to how low of a psi I can run.

How low can I go with 42mm rims, and 2.6's? What are others out there doing?

I am sure that this has been asked quite a bit - feel free to tell me to refer to the search if so...

Always in the wrong gear
3,317 Posts
According to the ibis site, 942s are 41 external and 35 internal. I don’t know if your post is a typo, a misunderstanding, or if you’re talking about a different rim.

I would not mount a 2.6 to an i42 rim.

Personally, I’d start with 1-2 psi less than you had on the i28/2.4 combo and slowly drop psi until you get some soft rim strikes, and up the psi 1/2-1 lb.

I had some i30/2.6 combo wheels in the past and seem to recall I was happy with 15f/17r at 155-160#, also on a singlespeed bike.
You also posted you run a higher psi in the front than back, which is unusual.

FWIW, I have the 29x3.0 XR4 at 9.5-10 psi (i43 rim) on the front of my bike and love it.

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