Fat inner tubes Schrader FULL threaded

[tenbikes]

Does anyone know where I might find 26x4 tubes with Schrader [car] valves with a full thread on the valves like a presta?

LBS has drawn a blank, but I know they exist 'cos I have one...but want two more!

Someone in the trade?

cheers

[Jdsk]

I'd ask SJS Cycles:
https://www.sjscycles.co.uk/inner-tubes-schrader-valve/

Jonathan

[tenbikes]

They are not listing them but I've dropped them an email: perhaps they will know.

[Mick F]

Can I ask why you want them like that?

I've not seen any full-threaded Schrader for yonks.

[tenbikes]

Without the locking effect of the nut the tubes rotate in the tyre at low pressure. Fat bikes off road use c5 psi. Sub 3psi in snow.

Presta valves are a poor alternative. Too fragile to use with gloves. I have broken or otherwise damaged a few over the decades. Not many, but one resulted in a very long walk.

There are no benefits to presta once you are beyond very ( very) narrow rims. I have always drilled out to 8mms to fit schrader. Note that if you have the common rubber covered schrader valves it is necessary to drill to 8.5mms otherwise it is a struggle to get the valve through.

I have a good number of fully threaded schrader in ' road' sizes, but only the one in 4"

Normally the correct answer for fat bikes is to go tubeless. I have done this for five wheel sets but my other two have rims which won't set up tubeless without a lot of faff, and I mean a lot.......and in the event of a bad puncture which is beyond the ability of the sealant, the tyre would come off the rim in seconds. Hence the desire for tubes for these two sets.

[peetee]

Try the next size up. Either 27.5 or 29 dia. With a tyre that volume a slightly oversized inner tube is of no consequence.
Or, I would ask, what size are motorcycle wheels?

[Paulatic]

Without the locking effect of the nut the tubes rotate in the tyre at low pressure. Fat bikes off road use c5 psi. Sub 3psi in snow.

Interesting.
We ran our quad bikes between 3&5 psi and initially used locked on valves but discovered the creep would eventually tear the tube from the valve. Ended up never locking the valve and yes they could end up at a funny angle and very occasionally going out of sight but all in all less trouble than locking them on.

[tenbikes]

I'm not surprised that that happened in quad bikes, but in the case of a mere bicycle what seems to happen is that the tube does indeed get a stretch at the valve, but it 'pings' back at some stage.
So far I've not had any problems. But there is always tomorrow!

[tenbikes]

Try the next size up. Either 27.5 or 29 dia. With a tyre that volume a slightly oversized inner tube is of no consequence.
Or, I would ask, what size are motorcycle wheels?

27.5 does indeed work. But I can't find these fully threaded either .....

[Mick F]

Ok, thanks.
I understand the reason for wanting them. Makes complete sense.

TBH, I reckon all Schrader valve bike tubes should come threaded.
The valve is mainly for vehicle use and they tend to be tubeless, so perhaps Mr Schrader only produces the one sort these days.

No excuse though.

[531colin]

Without the locking effect of the nut the tubes rotate in the tyre at low pressure. Fat bikes off road use c5 psi. Sub 3psi in snow.

Interesting.
We ran our quad bikes between 3&5 psi and initially used locked on valves but discovered the creep would eventually tear the tube from the valve. Ended up never locking the valve and yes they could end up at a funny angle and very occasionally going out of sight but all in all less trouble than locking them on.

this is a problem in trials motor bikes, where the tyres are run at low pressure and there is a bit of power.
what really happens is the wheel rotates within the tyre and rips the valve out of the tube. Used to be a problem in powerful road motorbikes before the invention of grippy rubber.
The answer (for motorbikes) is a security bolt which clamps the tyre bead to the rim https://uk.search.yahoo.com/yhs/search? ... 2BzA%3D%3D