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Discussion Starter · #1 ·
would it be possible to use a 700c road tube instead of an off-road specific tube for a 29er wheel?

thanks! :)
 

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Angry bunny
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CabRider said:
would it be possible to use a 700c road tube instead of an off-road specific tube for a 29er wheel?

thanks! :)
One of the guys I ride with over here uses tourer tubes in his tyres.
Have not heard of him having any problems with this.
 

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Recovering couch patato
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Look at it this way. A 700c tires made for 23 or 35mm will have to expand more to match the 29x2.1" tire's volume than a 26x2.1" once. More stretch=higher tension=more fragile.
26x2.3" tubes are dead-easy to mount 29". Just a little bit of air in the and they just fit the 700c rim nicely. Some pre-stretch them by putting lots of air in them for a longer time..
 

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Discussion Starter · #4 ·
thanks for the tip, Cloxxki. That eases my mind quite a bit, since 29er bikes (and 29er specific parts) are extremely rare where I'm at.

Just covering all the bases before I start my 29er build :)

Cloxxki said:
Look at it this way. A 700c tires made for 23 or 35mm will have to expand more to match the 29x2.1" tire's volume than a 26x2.1" once. More stretch=higher tension=more fragile.
26x2.3" tubes are dead-easy to mount 29". Just a little bit of air in the and they just fit the 700c rim nicely. Some pre-stretch them by putting lots of air in them for a longer time..
 

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I've had the same experience as Cloxxki...

I've had trouble running road tubes in even something as narrow as a 700x42mm IRC Mythos CX on my KM. They don't seem to stretch uniformly and leave parts of the tire unfilled leading to lots of flats.
 

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For semi-29" tires like the 42's, I like plain 26x1.5-2.3" tubes. Stretched to 28" they are already thinner than they originally were and form a good match to the tire, so little tension. Just pay attention though, this week I inflated a loose fitting wire 45mm tire (all messed up shaped) with such a tube and it managed to get under the bead, so BOOM. Same would have happened with a 700x40mm tube I'm sure though. The tire was really messed up, been in a warehouse for too long before I bought it, and being shipped folded over.
 

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Another approach

Has anybody tried two 700C tubes? Drill another valve hole and voila! :)

(waiting for my frame...)
 

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CabRider said:
would it be possible to use a 700c road tube instead of an off-road specific tube for a 29er wheel?

I'm having problems running big Hybrid tubes on my 29er.

I've done two Schwalbe 700c slime tubes; they became strained at the valve stem, such that the seams failed. One gave me a slow puncture that only showed itself after a ride, (held pressure for days in the garage). The other just let go, blew the tyre off the rim spewing forth green slime...nice!

HT
 
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