Series 1 Jota cast wheels - inner tube or not ??

J

jotaman1

New member
Hi Guys

Just wondering if the Laverda cast wheels on my jota needs a inner tube - i'm fitting a new set of Pirelli Phantoms and when taking old 10 yrs tyre of (was a bitch of a job ....) it had a tube...

I cant remember if they need tubes or not ???

 
Some people fit tubeless tyres.
Some folk have it done professionally which involves some machining.
Others I have seen just whack some silicone sealant round a tubeless valve and tighten it up.
I am sure the insurance companies would have a field day if they found evidence of this in the event of a crash resulting in a claim.

My personal view is don't fuck with tubeless on standard rims.
I use wheels designed to run tubeless tyres from the start (and yes my insurance company is aware).

Grant
 
Couldn't agree more. Tubeless rims have a security ridge cast on the inside of the shoulder to keep the tyre on the rim in the event of rapid deflation and will have "tubeless application" clearly cast on the wheel. The amount of debris on the roads now is bloody disgraceful, I had the AA recover a guy off the M1 to the shop with a pair of sidecutters embedded in his back tyre, that was a proper rapid deflation, but he managed to keep it upright. Fair play.
 
I'm in the other camp.....had the rim modified...flattened on the inside to allow the valve to seal. Never had a problem in years. Do a search....lots whom have done it and lots whom  have not.  My reason for doing it was in Canada I could be a 100s of miles or km from a shop I would trust to remove and replace a tire if I got a flat with a tube.  This way I have a good chance to plug it and continue riding.
 
henrywillms said:
I'm in the other camp.....had the rim modified...flattened on the inside to allow the valve to seal. Never had a problem in years. Do a search....lots whom have done it and lots whom  have not.  My reason for doing it was in Canada I could be a 100s of miles or km from a shop I would trust to remove and replace a tire if I got a flat with a tube.  This way I have a good chance to plug it and continue riding.
Click to expand...

Hmmm.. sounds like it may work
 
I sincerely hope you're never a 100 miles from A&E. A "normal" puncture is usually a self tapping screw or nail from the back of contractors vans and modern tyre technology will self seal to a certain extent and deflate slowly enough to do something about it. I.E. ring for a breakdown truck. It's just not worth it, as Grant said try an insurance claim. It wouldn't pass an MOT in the UK. 
 
BobSol said:
I sincerely hope you're never a 100 miles from A&E. A "normal" puncture is usually a self tapping screw or nail from the back of contractors vans and modern tyre technology will self seal to a certain extent and deflate slowly enough to do something about it. I.E. ring for a breakdown truck. It's just not worth it, as Grant said try an insurance claim. It wouldn't pass an MOT in the UK.
Click to expand...

(bigthumb)
 
you can modify the rim to take the tubeless valve but you cannot modify the rim to have the tubeless tyre edge profile all around its 360 degrees, it just so happens that it has been done and AFAIAA no one has got hurt, that does not mean no one gets hurt in the future, if you want to save the weight of the tube and have the convenience of a wheel on and roadside (dodgy) plug, then get some wheels designed for tubeless tyres
CLEM
 
Doing my bit to keep this going😉sounds like less people have been maimed or killed by this mod than by breaking Jota bars?
 
CLEMTOG said:
you can modify the rim to take the tubeless valve but you cannot modify the rim to have the tubeless tyre edge profile all around its 360 degrees, it just so happens that it has been done and AFAIAA no one has got hurt, that does not mean no one gets hurt in the future, if you want to save the weight of the tube and have the convenience of a wheel on and roadside (dodgy) plug, then get some wheels designed for tubeless tyres
CLEM
Click to expand...

Save weight  :LOL: :LOL: :LOL: :LOL: the wheels weigh a ton.. or so...( Wonder if Dymag do some for the Laverda ...  ::))

No i was just curious as i couldnt remember all the way back to 70's when i bought/rode it if the bike actually ran tubless wheesl/tyres..

Now i know , i'll obviously run them with tubes..

 
I am pretty sure this has been argued before. Plenty of people have run them tubeless with a correct valve fitment for decades without problem. We raced with them tubeless and getting them off the bead was the hardest bit of tyre changes. Insurance is another issue, and I would like to know if they fail MOT type inspection. Is it stamped on the wheel "tube only"?
I have one of those "dodgy" plugs in my VFR80 since it got a tek screw in the brand new rear tyre two years ago, no problem. OHS must state that they are emergency to get you to a tyre shop of course.
 
all the tyre shops that I know of no longer fit plugs from the outside to car tyres, they remove the tyre and fit a mushroom headed plug from the inside, the same parameter must surely apply to bikes but even more so, one wheel down on a car is bad enough but on a bike????

The Laverda cast wheels can and do take tubeless tyres, but this is not approved, in Germany, I imagine you could find yourself in big trouble with TUV and type approval. The "inside" edge of the tyre on "proper" tubeless rims has a shoulder to bear on, on non tubeless rims (not specifically Laverda) this is not present. It only works on Laverda cast wheels because the dimensions are very tight, witness how hard the tyres can be to mount and dismount, from memory thin flange wheels are worse than thick in this respect, or did I imagine that?
CLEM
 
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