tube size confusion

[s.e.charles]

aww jeez . . . . are the tube i ordered NOT going to work . . . .

ps: i just ordered (2 + spare) the SV16 tubes w/ 40 presta from the Big A; so i can send them back if it's a problem.

https://www.amazon.com/dp/B0043Q1D1W?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1&psc=1

i'm ready to take up knitting!

 

[hamster]

Those should work - they say 700C and 630, which is 27" in UK speak. As I said, the imperial size numbers are confusing.

 

[grantoury]

aww jeez . . . . are the tube i ordered NOT going to work . . . .

ps: i just ordered (2 + spare) the SV16 tubes w/ 40 presta from the Big A; so i can send them back if it's a problem.

https://www.amazon.com/dp/B0043Q1D1W?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1&psc=1

i'm ready to take up knitting!

You'll be studying wool thickness variations...

Respect to @non-fixie for a decent explanation. I think you have to consider almost 150 years of cycling history and different countries handling different measuring systems and developing several wheel sizes for different applications and you end up with a maze of sizes. Etrto has unified different sizes into a system but still older terms persist...

 

[non-fixie]

Don't worry. Inner tubes are very strong and very flexible. They'll happily fit themselves into any space allotted to them.

 

[RobLoasby]

Don't worry. Inner tubes are very strong and very flexible. They'll happily fit themselves into any space allotted to them.

“No, I said blow it up to 30 psi, not 30 bar!”

 

[s.e.charles]

well . . . you fellows must be clairvoyant. my first tube/ tire swap came with a similar bang.

when it got to 80# (sidewall indicates required 95#) i noticed the tire bead becoming exposed more than usual. as i began to unscrew the pump head, i thought i heard a hiss and then POW! tube split out of the other side of the tire @ the valve location.

dusted myself & wheel/ tire off, and grabbed another tube. second time i filled to 55#, bounced the assembly on the floor a bunch of times, and let it sit overnight. yesterday i filled to 80# and there it sits.

i don't know if the tube was old (in its box) or i did something wrong with it or tyre. maybe too much talc?

in any event, is it mandatory i pump hard to 95# ? i'm a bit leery . . . . .

(using Pasela Panaracer gum walls 27" x 1 1/4" & 32 - 630 tubes)