Valve length

[Milena]

So I am researching to find out what tubes I need in case of puncture for my bike, a Carrera Crossfire 3 bought this year.

Bike details including specification is in the link below:
https://www.halfords.com/bikes/hybr...d-bike-2020---grey---s-m-l-frames-346094.html

Sites say that the deeper the rim, the longer the valve needs to be.
But how does that make sense? The valve is part of the tube that sits on the inwards facing rim. The hole is right there. It does not need to cross the length of the rim to get to the hole.

And also, what size valve do I need?
I am looking at Halfords website:
https://www.halfords.com/cycling/bike-parts/inner-tubes/?prefn1=brandname&prefv1=Schwalbe&prefn2=diameter&prefv2=700c&prefn3=type&prefv3=Presta Inner Tubes
I don't know if that link will have the filters I selected.
If not please select the following from the left hand side of filter options on Halfords (only visible on the left hand side if viewing on a Laptop or PC with the browser page taking up the full screen and not in split screen or other configuration) website under the section ''Inner Tubes'' which is in: Home> Cycling > Bike Parts > Inner Tubes.

Filter options
Diameter: 700c
Product Type: Presta Inner Tubes
Brand: Schwalbe

Click on the second tube: Schwalbe Presta Inner Tube - 700c (251253) From £4.00 *
Select 700C X 28 - 45C which I believe would be the size I need.
The product title then changes to read - Schwalbe Bike Inner Tube, 700c x 28 - 45c (SV17) (355559)
The product image shows DV17.
But no valve length is mentioned.
The price is £4.

If you click the first result: Schwalbe Presta Bike Inner Tube, 700c, 60mm Valve
(251279) From £5.59
Select option 700C X 28 - 47C.
The product title and part number changes to: Schwalbe Presta Bike Inner Tube, 700c x 28 - 47c, 60mm Valve (355567) and it costs £6.99.
£2.99 MORE than the other tube. Why does it cost more?

That lists the size of the valve as 60mm and the photo shows a box that reads 'SV Extra Long 17'.
So what's going on? First one does not mention valve length and I don't know what length it is and the box also does not match the item description.

And looked at this info as I am looking to buy Schwalbe: https://www.schwalbe.com/files/schwalbe/layout/images/schlauchfinder/Schlauchtabelle_Ansicht.pdf
What is the difference between SV15 and SV17?

Here is a tube for £5.16 that is 50mm valve length, Schwalbe 700 x 28-45c Inner Tube - Presta Valve: https://www.tweekscycles.com/schwal...e-presta-valve-i-dtuse74p/#product.attributes

Also do new tubes come with the plastic screw on cap? I cannot find any tube unboxing videos on youtube.

Thanks

 

[Paulus]

Welcome back.
What is the length of the tube you are changing? Some rims are deeper section so need a longer valve stem.
Just buy what you need and don't worry about the price

 

[Milena]

Welcome back.
What is the length of the tube you are changing? Some rims are deeper section so need a longer valve stem.
Just buy what you need and don't worry about the price

Mod Note:
Impolite post removed.

 

[vickster]

How long are the current valves? Get the ruler out and buy the same.
Yes all new tubes should come with a valve cap (schwalbe ones are clear), or you can just reuse the current ones if not split

 

[Ajax Bay]

Bike details including specification is in the link below:
https://www.halfords.com/bikes/hybr...d-bike-2020---grey---s-m-l-frames-346094.html

My father was fond of saying "Life's not fair."
I appreciate typing your OP might be therapeutic: I hope so.
But let's see if we (I) can help you with more success than your first and last 12 page thread.
From the specs the tyre is a 42-622. So the tube needs to be the same (or little under)(ie 622 and close to 42). I'm assuming the current valves are Presta (Schrader will not fit through the valve hole drilled in the rim). The rim is not deep: max 25mm, I estimate from image.
The shortest valve will be 30mm but 40mm is more 'normal' and easily long enough. 60mm valves when not needed are just irritating and can be pulled over during pumping and in extremis cause damage to valve seat.
If at Hal fords: https://www.halfords.com/cycling/bi...schwalbe-presta-inner-tube---700c-251253.html
Today I would buy a couple or three of these from SJS Cycles: https://www.sjscycles.co.uk/inner-tubes/vittoria-ultralite-presta-tube-700-x-3038c-3038-x-62253162/
These Vittoria (reputable make btw) are 38-622 with 36mm valve and actually (they stretch) will be easier to fit than the slightly chunkier ones. At £2 (bargain) they're an attractive price and P&P is only £3.50 so buy 2 and you're in the money: buy 3 and you're rolling in it.

 

[MichaelW2]

Any Presta valve can go into into hole in the rim. They need to be long enough to come out the other side ( between the spokes) with room to attach a pump.
If they are much longer than neccessary, they act as long levers so you can bend the valve during aggressive pumping.

 

[TheDoctor]

Equally, if the valve is too long it'll work. If it's too short it, well, won't.

 

[Milena]

My father was fond of saying "Life's not fair."
I appreciate typing your OP might be therapeutic: I hope so.
But let's see if we (I) can help you with more success than your last 12 page thread.
From the specs the tyre is a 42-622. So the tube needs to be the same (or little under)(ie 622 and close to 42). I'm assuming the current valves are Presta (Schrader will not fit through the valve hole drilled in the rim). The rim is not deep: max 25mm, I estimate from image.
The shortest valve will be 30mm but 40mm is more 'normal' and easily long enough. 60mm valves when not needed are just irritating and can be pulled over during pumping and in extremis cause damage to valve seat.
If at Hal fords: https://www.halfords.com/cycling/bi...schwalbe-presta-inner-tube---700c-251253.html
Today I would buy a couple or three of these from SJS Cycles: https://www.sjscycles.co.uk/inner-tubes/vittoria-ultralite-presta-tube-700-x-3038c-3038-x-62253162/
These Vittoria (reputable make btw) are 38-622 with 36mm valve and actually (they stretch) will be easier to fit than the slightly chunkier ones. At £2 (bargain) they're an attractive price and P&P is only £3.50 so buy 2 and you're in the money: buy 3 and you're rolling in it.

Those cheap ones say 30-38c. But my tire is 42c ...surely they're too small?

 

[gcogger]

Sites say that the deeper the rim, the longer the valve needs to be.
But how does that make sense? The valve is part of the tube that sits on the inwards facing rim. The hole is right there. It does not need to cross the length of the rim to get to the hole.

Just addressing that one point, I think I can see where the confusion lies? Take a look at the cross-section image here:
https://www.spacycles.co.uk/m20b0s116p2961/EXAL-XR3

You can see that the inner tube and one end of the valve sit well above the bottom part of the rim, which is why a deeper rim needs a longer valve.

 

[Alex321]

So I am researching to find out what tubes I need in case of puncture for my bike, a Carrera Crossfire 3 bought this year.

Bike details including specification is in the link below:
https://www.halfords.com/bikes/hybr...d-bike-2020---grey---s-m-l-frames-346094.html

Sites say that the deeper the rim, the longer the valve needs to be.
But how does that make sense? The valve is part of the tube that sits on the inwards facing rim. The hole is right there. It does not need to cross the length of the rim to get to the hole.

Deep section rims have an inner section, and two holes separated by the distance between the inner and outer parts.

They have to do this in order for the tubes to work. If the tube wen all the way down to the inner edge of the rim, it would be stretching too much to last well.

This shows typical cross sections of rims of 33mm, 45mm and 67mm
https://alsbikeshed.co.uk/assets/img/winspace/hyper23-options.png

The valve stem needs to be long enough to stretch from the middle of the top line in the section to the middle of the bottom linme, with enough sticking out to get the pump head onto.

And also, what size valve do I need?

Difficult to be quite sure, but that wheel doesn't look to be deep section, so you can probably get away with "standard" length valves, which I think are 40mm stems.

Filter options
Diameter: 700c
Product Type: Presta Inner Tubes
Brand: Schwalbe

Click on the second tube: Schwalbe Presta Inner Tube - 700c (251253) From £4.00 *
Select 700C X 28 - 45C which I believe would be the size I need.
The product title then changes to read - Schwalbe Bike Inner Tube, 700c x 28 - 45c (SV17) (355559)
The product image shows DV17.
But no valve length is mentioned.
The price is £4.

If the image is right, that one is not a presta valve in that size. It is showing a woods valve.

If you click the first result: Schwalbe Presta Bike Inner Tube, 700c, 60mm Valve
(251279) From £5.59
Select option 700C X 28 - 47C.
The product title and part number changes to: Schwalbe Presta Bike Inner Tube, 700c x 28 - 47c, 60mm Valve (355567) and it costs £6.99.
£2.99 MORE than the other tube. Why does it cost more?

Because it is different. Even the smaller option is £1.59 more, the larger option has more rubber than the smaller.

But if you compare the 18-28C in both (I know they are no use to you, but that is the only size present in both), there is only 60p differenbce, and that will be because of the valve length.

It looks like the 28-45C one probably does have the woods valve, which is why it is so much cheaper.

That lists the size of the valve as 60mm and the photo shows a box that reads 'SV Extra Long 17'.
So what's going on? First one does not mention valve length and I don't know what length it is and the box also does not match the item description.

It looks like the bigger one is a different product. If you click woods in the valve type, it only shows that product, and you note it doesn't actually say anywhere in the title of the product that it is presta. It does say in the specification that it is 40mm.

And looked at this info as I am looking to buy Schwalbe: https://www.schwalbe.com/files/schwalbe/layout/images/schlauchfinder/Schlauchtabelle_Ansicht.pdf
What is the difference between SV15 and SV17?

SV15 is 18-28mm, SV17 is 28-45mm.

And the S means presta valve, D means Woods valve, A would mean Schrader valve.

Here is a tube for £5.16 that is 50mm valve length, Schwalbe 700 x 28-45c Inner Tube - Presta Valve: https://www.tweekscycles.com/schwal...e-presta-valve-i-dtuse74p/#product.attributes

Also do new tubes come with the plastic screw on cap? I cannot find any tube unboxing videos on youtube.

Yes.

 

[Ajax Bay]

To illustrate @gcogger 's answer, here is a cross section of my daughter's 80mm deep wheel rim. You can see that the base of the valve is a looong way from the inner edge of the rim. She needs a 60mm valve (running TL mind) and a 40 mm extender. [But the OP's rims are max 25mm deep.]

 

[Ajax Bay]

Those cheap ones say 30-38c. But my tire is 42c ...surely they're too small?

No, they will be fine, as I explained. And they're not cheap, they're 'on sale': Vittoria is an excellent make.

 

[Milena]

No, they will be fine, as I explained. And they're not cheap, they're 'on sale': Vittoria is an excellent make.

I didn't mean cheap as in quality.
I said cheap as a way to identify them out of the 2 you wrote about.

Why doesn't it have French sizes listed and why did you write it in a size I don't know about?
Halford's website says the tires are 700 x 42C.

 

[Milena]

Thank you everyone for your replies. I will review them carefully when I get time. I've skim read for now.

 

[classic33]

Also do new tubes come with the plastic screw on cap? I cannot find any tube unboxing videos on youtube.

Thanks

There's a few videos here
Unboxing an innertube