Why can't I find an inner tube for 29 - 2.3" and 2.6"?

[backstep]

Newbie alert! I have a Levo turbo with config below. I can't find an inner tube on any of the big online cycling stores in Europe (bike24, Wiggle etc.) that is suitable for both 2.3 and 2.6. The closest I have found is a continental rated 1.75 - 2.5. I figure I must be misunderstanding something, this should be super easy to find no? Or do I need to buy separate tubes for front and rear? Also what size Presta valve do I need? 42mm?

RIMS	Roval 29, hookless alloy, 30mm inner width, tubeless ready
FRONT HUB	Shimano MT400-B, Centerlock 28h, 15x110 Boost
REAR HUB	Shimano MT510-B, Centerlock 28h, 12x148 Boost, Microspline
SPOKES	DT Swiss Industry
FRONT TIRE	Butcher, GRID TRAIL casing, GRIPTON® compound, 2Bliss Ready, 29x2.6"
REAR TIRE	Eliminator, GRID TRAIL casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"
INNER TUBES	Standard, Presta valve

 

[neiloxford]

Cyclestore.co.uk

www.cyclestore.co.uk

 

[Pyr0]

Are your tyres definitely different?
My bike was specified with the same sizes, but came with 2.6 front and back.

Specialized do a 29 X 2.4-2.8 tube
03119-0336

Specialized Standard Tube | Tredz Bikes

Save up to 43% - Specialized Standard Tube from £3.99 or available with 0% APR finance on baskets over £99. All Inner Tubes are delivered free to the UK mainland*, 365 day returns & Price Match. Buy Now.

www.tredz.co.uk

 

[Gary]

You do realise all butyl rubber inner tubes stretch?
ANY 29" tube will fit both of your tyres.
In an emergency with a little patience fitting a 27.5 or even 26" tube will fit.

To save weight (without shelling out a fortune) I used to use 24x 1.9 tubes in my 26" XC bikes for racing BITD..

Also unless you have particularly deep section rims any valve length will do.