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)

 

[non-fixie]

After mounting the tyre, add a little air and make sure that the tyre bead is properly seated before increasing the pressure.

This is particularly important when using hookless rims. And folding tyres with kevlar beads (as opposed to steel wires) have a strong tendency to blow off of those rims at pressures above 70 psi or so.

 

[s.e.charles]

combined with my overzealousness to get the tyres & tubes switched over, i think this is where i zigged when i should have zagged.

the Araya rims are of the hookless variety, and i was evidently less observant than i should have been.

i inflated the tubes/ types to about 55#, bounced them around a bit to let them know it's time to wake up*, and let them sit overnight. seeing no evidence of trouble, i let the pressure down and then filled them up to 80#. i will keep them there until i am ready to test ride the bike. much has to be done before that (fenders, racks, gee-gaws & doo-dads) but i feel good about my progress.

thanks for the helps.

sid

*the Japanese craftsmen do this with their woodworking tools before starting a job.

i also believe inanimate objects convey some of their spirit to the user.

 

[Nob]

Hookless IMO are extremely dangerous & personally I’d never buy or ever use them….

 

[s.e.charles]

i agree; kind of got some bad vibrations when working on them. since this is not going to be my daily driver bike, i'm probably going to swap them out and at the same time turn the rear axle into a skewered/ quick release (solid w/ nuts now).

as this goes together, it will only be a 3-5 mile bike for around the neighborhood.

i am having great fun with it. if you think i asked a lot of questions buying two tire tubes, just wait 'til i get to the above projects!

banned for infinity? could be . . . .