Author Topic: Tyre seating issue  (Read 283 times)

Silverfox

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Tyre seating issue
« on: January 24, 2021, 11:09:24 AM »
Hi all,

I am trying to fit a new tyre but the it just wont seat on the rim - plenty of lube and 85psi wont do it. I took it to my mechanic and he couldn't fit it either - i have noticed the tyre is tubeless and its going on a tubed rim (with tube), could this be the issue?


Cheers
Gareth

themoudie

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Re: Tyre seating issue
« Reply #1 on: January 24, 2021, 12:00:41 PM »
Morning Gareth,

Had the same problem with Morini 125H wheels that are Grimeca cast and Hiedenau tyres (2.75 and 3.00) size. Ex race tyre fitter who does all my tyre fitting had 85 psi and lashings of lube and even then they were reluctant to seat. So, put tyres in a warm room to soften and cleaned the wheels and tubes of lube and started afresh after half a day. Still a fight and still required 85 psi to seat, but they did seat.

Conclusion: some tyres have stiffer tyre sidewalls than others, the tyre needs to be warm and as flexible as possible. Some wheel rims, especially the cast, narrower sizes have little space in the central well of the rim for both tyre walls and a partially inflated tube. Lots of use of a rubber mallet and bouncing the whole assembly on the floor, as the pressure is increased, appeared to be the solution. Old tyres that look OK, but are more than 5 years old need to be given the heave ho.

I know this isn't a panacea, but at least you know that you are not alone in experiencing this problem. OH! For God's sake don't use Fairy, I corroded a Borrani rim to powder, due to the high salts content!  :(

Regards, Bill

Silverfox

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Re: Tyre seating issue
« Reply #2 on: January 24, 2021, 12:22:59 PM »
Thanks Bill as always most helpful.

Does the fact the tyre is tubeless have any bearing on this?

CrazyFrog

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Re: Tyre seating issue
« Reply #3 on: January 24, 2021, 02:51:20 PM »
Thanks Bill as always most helpful.

Does the fact the tyre is tubeless have any bearing on this?

I may be wrong Gareth, but I think tubeless tyres have stiffer sidewalls, so maybe that's a contributing factor....
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iansoady

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Re: Tyre seating issue
« Reply #4 on: January 24, 2021, 04:21:34 PM »
They're also designed to seal against the rim so have a smooth(er?) surface contacting it, maybe not allowing as much sliding movement?

I find different makes of tyres vary wildly in how hard they are to fit. Yesterdays I was fitting a Mitas H01 to the back wheel of the Francis-Barnett and only needed levers for the final few inches. I remember having real struggles with TT100s in the past. The easiest are trials tyres with very soft sidewalls.
Ian.
1952 Norton ES2
1955 Francis Barnett Cruiser

trophydave

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Re: Tyre seating issue
« Reply #5 on: January 24, 2021, 04:25:33 PM »
My 955 Tiger had tubeless tyres on spoked wheels with tubes in them.They went on ok with just a footpump to blow them up with.As Bill said,put them in a warm place for a few hours and use plenty of tyre soap.

tommy

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Re: Tyre seating issue
« Reply #6 on: January 30, 2021, 10:17:50 PM »
your right bill never use fairy  or similar that stuff will eats wheels tubes  spokes ,its tempting to use loads to pop out a tyre , but dont i ruined a dommie front wheel that way :-[ ,next thing im planning when im better is to convert my spoked wheels to tubeless   should be fun tommy

iansoady

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Re: Tyre seating issue
« Reply #7 on: January 31, 2021, 11:37:21 AM »
I converted the spoked wheels on my 955 Tiger with no problems. Details here: https://www.triumphrat.net/threads/what-i-did-on-my-holidays-spoke-sealing.46888/ although the photos seem to have disappeared (hardly surprising). I have them if you're interested.

Despite neing told I'd kill myself I seem to still be here.....
Ian.
1952 Norton ES2
1955 Francis Barnett Cruiser

Moto63

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Re: Tyre seating issue
« Reply #8 on: January 31, 2021, 05:07:48 PM »


Despite neing told I'd kill myself I seem to still be here.....
Ah but for all we know Ian you may just be a cloned android of the REAL Ian who dud if fact kill himself when he converted his spoked wheels to tubeless 🤣😉

tommy

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Re: Tyre seating issue
« Reply #9 on: January 31, 2021, 11:14:13 PM »
thanks ian some photos would be helpful i was talking to a lad on line who did his gb wheels years ago with no problems ,but he used a special tape ,i was going to do it with a strong mastic ,i,m  collecting info on  different ways off doing it for now  ta tommy

iansoady

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Re: Tyre seating issue
« Reply #10 on: February 01, 2021, 10:49:38 AM »


Despite neing told I'd kill myself I seem to still be here.....
Ah but for all we know Ian you may just be a cloned android of the REAL Ian who dud if fact kill himself when he converted his spoked wheels to tubeless 🤣😉

Sussed!

Tommy - I'll see what I can do. I have the pics somewhere.
Ian.
1952 Norton ES2
1955 Francis Barnett Cruiser

iansoady

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Re: Tyre seating issue
« Reply #11 on: February 01, 2021, 11:06:00 AM »
Tommy: some pics

The spokes and nipples before applying the sealer: cleaned up with a small wire brush in the dremel.




First coat of sealer applied:



Second coat of sealer:



This is the sealer I used. Kindly donated by a local supplier as it was a few weeks out of date so couldn't be used on aircraft:




« Last Edit: February 02, 2021, 10:26:22 AM by iansoady »
Ian.
1952 Norton ES2
1955 Francis Barnett Cruiser

Richard

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Re: Tyre seating issue
« Reply #12 on: February 01, 2021, 06:09:35 PM »
I continue to recommend KY jelly, a fantastic rubber lubricant that won't harm steel and NEVER rots rubber - for obvious reasons I suppose.
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tommy

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Re: Tyre seating issue
« Reply #13 on: February 01, 2021, 08:13:57 PM »
 fantastic ian ta was it  much hassle to balance the wheels after the conversion ta tommy

xbally

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Re: Tyre seating issue
« Reply #14 on: February 01, 2021, 10:29:39 PM »
I continue to recommend KY jelly, a fantastic rubber lubricant that won't harm steel and NEVER rots rubber - for obvious reasons I suppose.

Well that's good to know. I can raid my wife's tube if I need any in the future!
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