Tubeless tyre valves?

[_Stretchie_]

Firstly I would like to say a massive thanks to Wideboy and Yorkie Chris for all the help and advice so far and Gid for the giggles and help doing it.

Basically, I got a 125 which just needs tyres, a reg plate and the front brakes cleaning and bleeding then I can MOT it.

As mentioned in an earlier thread there is little-to-no information or support for the Chinese Sukida Patriot SK125-5 that I bought used. The tyre sizes are 2.75x 18 Tubed on the front and 110/90x16 tubeless on the rear and I’ve been trying to find out what my tyre choices are for getting a matched set from a known provider instead of the current no-name stuff that is old and cracked on there at the minute.

After weeks of looking and finding no answers I decided to risk it for a biscuit and get a pair of tubeless tyres from Metzeler (ME22 front and ME77 rear). I have never changed a motorbike tyre before so Wideboy and Yorkie Chris helped me out loads with advice, so I bought a set of tyre levers, rim protectors, tyre paste, balancing weights and valve tools.

Gid and mrs came over on Saturday so we had a go then, we got the rear tubeless tyre swapped fine, no big bang as it seated but it’s deffo on there and had it up to 60psi before letting some air out, but then when we got the front TUBED tyre off, I had a problem with the ‘bung’ type spare valve I had. The hole in the wheel to pass the valve through was pretty much the same diameter as the threaded valve shaft itself (A in the diagram below) so couldn’t even pull through the rubber coated part of the stem (B in diagram) let alone get the bung part (C in diagram) in place



So I’m a bit lost, does this mean that the wheel will only take a tubed tyre?

I’ve been looking at different types of valve and there does seem to be a tubeless valve that may fit, like this one

http://www.mandp.co.uk/productinfo/5...d-Caps/Economy
or this one
http://www.mandp.co.uk/productinfo/5...d-Caps/Economy


It looks like the bottom two layers fit up to the inside of the wheel, then on the outside you put the next washer, tighten the first nut then tighten the second lock nut up to it, is this right?

I just want a decent pair of tyres on this bike because I know I’m going to be a knob and try getting my knee down on it after a while, and I don’t have the option of getting rid and buying a different bike, if I could afford that I would have just bought an old CG125 in the first place.

Thank you mighty org, I will sacrifice many virgins in your honor (if I can find any in Gloucester that is)

[NTECUK]

Both the WM and CP profiles were meant to be used with tubes and should be used with tubes.
.No one is going to say it is OK to run tubeless where there once was a tube — it’s just too great a liability exposure. As an added impediment to going tubeless on tube-type rims, the valve stem hole in the rim is larger on tubeless rims than on tube-type rims. To use a proper tubeless valve stem you have to enlarge the hole in the rim. Once you do that, I’d think you’d never be able to go back to a tube in that rim. I

[yorkie_chris]

Can't you just stick the tube back in?

[Wideboy]

I'd try chris' idea before you spend anymore money, it might inflate a bit of a funny shape but that remains to been seen. As I said the other day the only option I can think of is taking a wheel off another bike and retro fitting it or swap out the front end. It could all be done on the cheap.

I would imagine fitting a tubeless tyre in place of a tubed would just lead to it losing pressure gradually or quickly.

[_Stretchie_]

Originally Posted by NTECUK

Both the WM and CP profiles were meant to be used with tubes and should be used with tubes.

Sorry dude, what is 'WM' and 'CP'?


My very first thought regarding tyres was to put on exactly what is on there already, tubed on the froned, tubeless on the rear but couldn't find a matching pair of tyres, in these (bloody stupid) sizes where the front is tubed and the rear tubeless.

The sizes alone make it hard to find a matched set of tyres, only three options really:

-Metzeler ME22 front & ME77 rear
Both of which are tubeless
-Michelin M45 front and rear
Both of which are tubed
-No name CMPO offerings(http://www.chinesemotorcyclepartsonl...13_SK125-5.php)
Only tubed

Based on the "Get what is on there" philosophy that cuts all of these out unless I go for unmatched tyres, I don't know if that is such a problem with a smaller bike, I am guessing the profile is pretty much the same across them all????

CMPO did say that you can fit tubed or tubeless on to these wheels

I hoping the long stem tubeless valves are a goer, then will go from there. If not will have to get unmatched tyres



** EDIT **

Oh, and I MIGHT have punctured the inner tube when I put the original front tyre and tube back on, by 'might' I mean I did

[_Stretchie_]

Originally Posted by NTECUK

Both the WM and CP profiles were meant to be used with tubes and should be used with tubes.
.No one is going to say it is OK to run tubeless where there once was a tube — it’s just too great a liability exposure. As an added impediment to going tubeless on tube-type rims, the valve stem hole in the rim is larger on tubeless rims than on tube-type rims. To use a proper tubeless valve stem you have to enlarge the hole in the rim. Once you do that, I’d think you’d never be able to go back to a tube in that rim. I

Ah haaaaa

http://www.motorcycleclassics.com/te...#axzz3C4NZLvXe


No idea what profile my wheels are though

[NTECUK]

The letters reference to the shape of the bead seat.
Tubles types have a ridge to locate the bead and then a space were the bead seat fits in.
Some wheels this is either no ridge or too small a gap twix ridge and the edge of the rim.
The side wall can then be pushed off the rim,pop no pressure. Nasty mess.
You can probly see if you have the right shape by eye. but I don't think that the Chinese are in the habit of following international standards so check the complete circumference.
A bit of thick card as a Guage that fits a tubeless wheel be easily made up.
It is your call if you belive it will stay seated

[NTECUK]

Hears a bit on tube/tubeless.
http://www.bmwmotorcycletech.info/section6.htm
If it were me.I'd measure up
Make my own mind up on what I can see,
Check my life insurance if i was going to drill out the hole and fit them without the tube.
Years ago the Yamaha XS1100 had some with tubed and some with tubeless wheels .
They looked vastly different on the inside

[_Stretchie_]

Ha haa, I'm not going to be dicking about with the wheels.

I'm just trying to find a decent pair of tyres that I can put on this stupid bloody bike

[aesmith]

Nothing wrong with putting a tube on the front, just because the tyre is rated as Tubeless doesn't mean it's unsafe with a tube.