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Presta valve too short + tire size question

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Presta valve too short + tire size question

Old 06-08-17, 11:40 AM
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Presta valve too short + tire size question

So I recently realised my presta valve was too short... being the rookie that I am, I never thought they sold valve extenders/longer valves until I got a flat, repaired my tube, and struggled as usual to inflate the tube. I never bothered looking on the internet, which to my amazement people were posting "just get longer valves".

I have always used 48mm valves, but they are very short and barely fit my pump (the beto pump from MEC in Canada). I browsed my local stores for 60mm valves, but they are not very common and cost at least an extra $5. For what, 12mm in length? So I am wondering what the experts/veterans suggest as an alternative...

Should I...
  1. keep buying standard 48mm valve tubes, get a cheap schrader adapter (its like $3 for one here)? Apparently they add enough length onto a short presta valve and since schrader valves are small anyway they will fit the other part of my pump.
  2. keep buying standard 48mm valve tubes, get a valve extender for threaded cores ($17 for one here)? I have no intention of getting removable cores, they seem to only be useful for sealant users + specialty extenders...
  3. just suck it up and pay the premium for 60mm valves?

Also 2nd question, what size tires are recommended? I never bothered to check as I used to take my bike to the shop for every small issue, and this one time I asked for a tire change they replaced my old front tire with a smaller one (I went from 700x25C to 700x23C - I didn't know any better at the time). Does it make a difference if my front tire is smaller, should I get a 700x25C again to match my rear tire? There wasn't much difference going from 25C to 23C but I feel like I ride a bit slower, although it might be due to the age of the bike (chain is in bad shape, seat hasnt been adjusted for years, wheels probably need truing, etc.)

thanks for reading my long question

Last edited by bikerookie14; 06-08-17 at 11:43 AM.
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Old 06-08-17, 11:48 AM
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There are longer stem presta tubes @ LBS, no more $ than the shorter ones..


Extenders only work with removable core P/V stems.. & you don't want those..

an expensive tire will ride better than a cheap one.

Does it make a difference if my front tire is smaller, should I get a 700x25C again to match my rear tire?
how OCD are you? that matters more than a couple mm of tire width, unless it , wider, just wont fit.





.....

Last edited by fietsbob; 06-08-17 at 11:55 AM.
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Old 06-08-17, 12:27 PM
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Learn to patch your tubes if you get flats. I ride 5000 miles/year and have been riding the same tubes for at least 3 years.
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Old 06-08-17, 12:53 PM
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Since you live in Canada: https://www.mec.ca/en/product/5037-1...resta-Valve%29
MEC has 60 mm presta valve inner tubes for $8.50
For years I rode 700 x 23 tires but I now ride 700 x 25, smoother ride and at least as fast
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Old 06-08-17, 02:08 PM
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Originally Posted by fietsbob
Extenders only work with removable core P/V stems.. & you don't want those.
You can get extenders that screw on top, and leave the valve below, or extenders that one is expected to remove the core, and put the core into the extender.

For the OP, if the valve is just barely long enough, then an extender that doesn't require the core to be removed might be best. Just screw it on, pump up, then remove. (somewhat like using the Schrader adapter as mentioned).

I have a couple of wheels/rims that the valves are just barely long enough for. I find a few things help.
  • That little valve retention nut can be handy to hold the valve in place.
  • Make sure your valve is 100% straight. A crooked valve could be a problem.
  • The valve usually descends 1/4" or so under pressure. So, the more you pump the tube, the better it gets. Even try the Schrader adapter until you get some pressure in the tube, and the tube retention nut screwed down. Then convert back to Presta.
Note, most of the handheld pumps can have the valve removed and reversed to convert from Presta to Schrader. It is usually a quick and easy process.


I ride either 23mm or 25mm tires, and can't tell much difference between them. I recently started paying attention to chipseal. It is hard to tell for sure, but I think it slows me down a couple of MPH over smooth pavement, so perhaps different tires would be better for the chipseal.


For larger tire sizes (28/32/35, etc), the quality of the tire will make a big difference.


As far as buying tubes, I frequently add a few tubes and small items to mail orders that meet the free shipping minimum. I think these come in 60mm and 80mm valves.

Vredestein Butyl Road Tube - Inner Tubes - Ribble Cycles
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Old 06-09-17, 08:56 AM
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hey thanks for the replies everyone! So I ended up getting a standard 48mm valve for now and I'm back riding. I did make sure to lock the valve this time and it worked a lot better despite the lock nut taking up more space

And yes I do need to learn how to properly patch my tires... I think I've done it 3 times ever, and all 3 times I ended up having to either patch again or replace the tube. I am so bad at fixing flats, even though I watch videos and read guides everytime I get a flat, it still takes me 45 mins minimum

probably will get a 25 tire and pump to only 100 seeing as most of my flats are punctures (with a classic rookie pinch flat here and there lol)

thanks again everyone!
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Old 06-09-17, 12:17 PM
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Just spend the money and get the long-stem valves of 50+mm in length.

When they flat, don't throw them out. Batch patch 3 of them when you accumulate them, using a new patch kit set, and you should be good to go. Patch 'em at home, not on the road - you can patch 3 flats in <15mins with no experience, and do it well, if you're doing it at home without the stress of holding up your ridemates.
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Old 06-09-17, 12:37 PM
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Two years ago I flatted south of Cambria on Hwy 1. It was 103F and the only bit of shade was occupied by a rattlesnake. It was my rear tire,and I was on a loaded tour, which was a pain in the butt in the heat. Pulling out my spare tube, I discovered that I had a valve that didn't clear my Velocity deep V rim.

I went a little nuts.

The snake just stared.

Trying to find the pinhole in the flat tube involved pumping it up and licking it until I could feel the leaking air on my tongue...all while keeping 1.5 eyes on the serpent. Rattlesnake induced cottonmouth and high temp dehydration kept the leak detection down to 35 minutes.

The snake, being totally unlike a dog, offered no comfort.

Finally was able to patch it and roll off to Morro Bay where I hit a bike shop and bought three tubes, all with freakishly long Presta valves. I now also carry a valve extender that just screws on to a presta stem, just in case I get stuck buying a short stem tube in a pinch.

IMHO, just buy the right bloody tubes eh?
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Old 06-09-17, 03:08 PM
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Originally Posted by bikerookie14
I browsed my local stores for 60mm valves, but they are not very common and cost at least an extra $5. For what, 12mm in length?
In addition for the additional 12mm in length, the extra $5.00 buys you freedom from frustration as you try to re-inflate your tire. Well worth it to me.
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Old 06-11-17, 11:36 AM
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Originally Posted by Retro Grouch
In addition for the additional 12mm in length, the extra $5.00 buys you freedom from frustration as you try to re-inflate your tire. Well worth it to me.
ya thats true, last thing I need before rushing out the door is to pump up a tire!!

no snakes in most of my province fortunately LOL.

also I never thought about batch patching, honestly the most frustrating part is getting tire off and back on again
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