Inner tube sizing help please!
- Thread starter Gez73
- Start date
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Cycleops
Legendary Member
- Location
- Accra, Ghana
Inner tube sizing isn't as critical as all that. These from Evan's should do the job at a bargain price.
https://www.evanscycles.com/fwe-26-inch-presta-valve-inner-tube-EV170029
Presta valve too which should suit. Most would be Shraeder which might be too big for the rim.
https://www.evanscycles.com/fwe-26-inch-presta-valve-inner-tube-EV170029
Presta valve too which should suit. Most would be Shraeder which might be too big for the rim.
Last edited:
Cycleops
Legendary Member
- Location
- Accra, Ghana
Doesn't realty matter, they're flexible. The valve type would be more important.
Cycleops
Legendary Member
- Location
- Accra, Ghana
Just make sure you check which valve you need.
SkipdiverJohn
Deplorable Brexiteer
- Location
- London
You'd really want a Shraeder valve tube for an old 26" 3-speed roadster though as the Presta valves are slimmer and may be a bit of a loose fit in the wheel rim hole. Note that the 26" English roadster rims are slightly larger than 26" MTB rims, as the sizing refers to the overall diameter with tyre fitted - so the MTB rims are smaller because the tyres themselves are bigger. In an emergency, you might well find a 26" MTB tube will work OK, so long as you can avoid pinching it with the tyre bead during fitting.
- Location
- Inside my skull
If you look to the right it has the etro sizing. It is 650x 35mm
- Location
- Inside my skull
mjr
Comfy armchair to one person & a plank to the next
- Location
- mostly Norfolk, sometimes Somerset
If you can find somewhere stocking Kenda inner tubes, it's the ones with "650A" written on the box in big white letters! Schwalbe markings are more subtle, but it'll say "AV12" fairly large on the box (assuming Schrader) or "DV12" if you like the superior Woods valve (uses Presta pump), as well as that tyre size in smaller writing. I don't think 26 inch mountain bike tubes will be happy in it (too small rim diameter and usually a fatter tube), but they might work.
mcshroom
Bionic Subsonic
- Location
- Egremont, Cumbria
The ERTO is 37-590, the number given on the left is the width, so the important number is the latter.
ERTO diameter for 286" mtb tyres is 559 which may be a little small but would probably work. A better fit would be 27.5" which have an ERTO diameter of 584, and should fit fine. 700c (ERTO 622) tubes fit 27" (ERTO 630) for example
mjr
Comfy armchair to one person & a plank to the next
- Location
- mostly Norfolk, sometimes Somerset
The ETRTO/ISO size is 39-590. The French size is 650x35A.
- Location
- Inside my skull
mjr
Comfy armchair to one person & a plank to the next
- Location
- mostly Norfolk, sometimes Somerset
Yeah, I can't type straight this evening.
Just type 26 x 1 3/8" tube into ebay and you'll get lots of matches. The rim will take Shrader or Woods valves. For a bike like that, I'd go with Woods but if you're only replacing one tube or just want a spare, obviously just use whatever you have at the moment to avoid pump compatibility issues out on the road.
