ilovecycling

Hey guys,

I'm looking to pick up a few Continental Race inner tubes from Competitive Cyclist, but don't know what valve length to go with - 36mm, 48mm, or 60mm.

The rims I'm using are 32mm deep Reynolds mv32c UL. The 48mm seems like the most obvious choice, but I don't want to risk not being able to get the pump head secured on the valve stem. Do you think the 48mm length is long enough?

I know I could take my current tubes out and measure the valve stem to see where I'm at right now, but I lost my only ruler and have no other way to accurately measure them. Besides that, I switched my tires and tubes over to a spare set of wheels yesterday and forgot to measure them while they were out. I'm too lazy to go buy a ruler and take my tubes out again.

Thanks in advance!

scroca

I'm too lazy to answer your question.

DScott

Longer is better than not quite long enough. Get the 60's.

And those wheels are wasted on you. You don't deserve them. Send them to me, c/o The Home for Misplaced Bike Schwag.

banerjek

I run 32mm deep rims and find the 48's just about perfect. The 60's are total overkill and will look insane.

There is some off chance that the pumps in my garage and on my bike as well as my CO2 inflator don't require as much stem as whatever you're using, but I think you'll be fine.

DScott

Yeah, I found out the hard way the amount of exposed valve that was just enough for my floor pump was not quite enough for the Co2 inflator.


Whoooooosh! Hey! Wtf! That didn't work. Must be me.

Try again. Fail again. Fail better. (thanks, b)

Second try. Whoooooosh! What the...?!?

Damn. No more cartridges. Gotta use the mini-pump. (cue image: monkey ********* a football)



Not a lesson I expected to get riding in the canyon to meet friends on a very dark and very cold winter morning. Made it, just barely.

That little extra dork-sauce added by an extra 12mm of stem per wheel isn't going to rock anybody's world off it axis, compared to what happens when your stuff doesn't work when you need it to.

ilovecycling

LOL...this is exactly why I decided to ask before I buy 5 tubes that won't work.

valleycyclist

The 48mm valve stems should be good. I use 40mm valve stems with 27mm rims and that is basically the shortest that a 27mm rim can handle without having issues inflating.

catonec 

no crime in having longer valve stems than you need. buy the big ones.

j-law

buy a tape measure

nacler22

I have attacks(same thing as mv32UL, only different) and use 48mm stems.
That is all.

learnmedia

Based on me using Conti 80mm valve stem lengths with my new 50mm Boyd clinchers, and having a comparatively better fit with my floor pump because of the extra length I say get the 60s.

DGozinya

48mm is 1.8 inches, 60mm is 2.3 inches. US letter size is 8.5 x 11. Fold short end twice over. You now have a 2.125 inch ruler. Valve is bigger? You have 60mm stems. Valve is shorter than that? You have 48mm. Close enough for government work...

pbd

merlinextraligh

Rolf Prima Tandem rims are 31 mm deep. Borrowed a tube with 48 mm valve stem, after a second flat.

It was not long enough to work with the C02 inflater we had, but just long enough to work with a Road Morph pump. I'd go with a 60mm.

Pain

I have 30mm rims and 48mm is just barely long enough, so I would go longer on 32mm rims.

ilovecycling

Thanks guys, really appreciate it!

Cdy291

48mm will be long enough most of the time but when you first install the tire and there's only a little air in the tube, the valve stem will not be pushed out all the way. That will make it very difficult to pump up your tires that first time. Get the 60mm.