650c tubes in 650b tires?
 

Anyone tried this? All i could find was either huge 650bs or 650cs in smaller widths. I used the 650cs and the were fine in town but after some fairly rough, loaded touring i was getting flats where i couldnt find any tire puncture or much of a hole in the tube. They seemed to last longer the lower they were inflated so i believe i have just over stretched the tube. Gonna find some 650b by 1.5

I’ve been using these.
https://cimg5.ibsrv.net/gimg/bikefor...68df708d8.jpeg

26" tubes are what you're looking for. Even Compass Rene Herse (ground zero for 650b wheels and tires) sells Schwalbe tubes labelled as 26" for 650b use.

https://cimg4.ibsrv.net/gimg/bikefor...342ab7a5f5.jpg

QBP sells their "Q-tubes" in 650B sizes. Not too bad at $8-9 retail.

I've been really impressed by those Schwalbe tubes. Pump them up outside of a tire and they expand very evenly, unlike some cheap tubes. Just make sure the valve core is tight before using them.

Ty everyone!

+1 on that! I spent a long time looking for a leak in a Schwalbe tube one night under a streetlight, until I finally realized that the core wasn’t fully tight. Now there’s a Park valve tool in each patch kit.

https://www.jensonusa.com/Park-Tool-...alve-Core-Tool

that is kinda awful really.

It can be frustrating the first time it happens, but it's not a big deal to tighten down the valve cores (I don't even use a tool, just two pairs of pliers) right when you get brand-new tubes. It's my habit regardless of brand now.

Pretty much every time someone posts a tool that I don't have, I order or go out and get one.

Thanks Dave! And ThermionicScott for the idea of tightening down all your cores before installing. I just got through patching about 20 tires, and inflated them all for an overnight leak test. 3 didn't make it, water test showed 2 had leaky valves.

Reading this , ya do know that 650c 571mm ERD and 650b is like 584mm ?

Good point, interchangeable.

while the original poster mentioned tubes... but complained about flats... just wanted to confirm there was not the anticipation that 650 c and b are the same rim diameter.... I have watched customers storm into a shop demanding there must be something wrong...

i do know that and was hesitant to use them because of that. However i didnt want to use the 584s they had that started at above 2 inches wide.
Tubes folded dont last that well either. I eventually found the size i needed and the shop i work at will begin stocking them. Most new 27.5 bikes have much wider than 38mm or 1.5" tires.

BITD I witnessed customers coming back months after purchasing a bike complaining that their tires were going flat, not believing that air molecules leaks very slowly through the tube rubber itself.

I probably shouldn't tell you about this one, then.

Thats... beautiful.

"Pliers works with 9-, 10-, 11- and 12-speed master links and chains"

Damn good thing I stopped at 8.

Some companies call 650B's 27.5's. I think that's stupid MTB terminology.

even when called 650b most dont stock anything smaller than 2. 38 or 42 translates to 1.5 to 1.75 or there abouts. Really 26 by 1 and 3/8s is close enough if its a decent tube.

Russell, that's the size I typically buy for 650b x 42's.

It's the Gremlins. Always up to no good.

seems to be working for me. Same tube as i used fo use in an old 3 speed. Go figure

One problem with using tubes for 590mm applications is that they’re usually Schrader valve while all of my 650b wheels are Presta. And I don’t plan on drilling them out.

Then again, I seem to be mostly setting up wheels tubeless these days.

It's simple, really. 27" > 29" == 28" > 27.5" > 26"