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120 rear tyre - LM2...

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Dukedesmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 04 Feb 2017 at 23:17
Had a game today with the front, basically I was struggling with tyre levers to get it off the wheel. 

As it was clearly going to end in damage or tears I took it to the bike shop and even his machine struggled to lift the tyre off the rim, in fact the machine stalled and needed 2 men to assist it.

Also had a pig of a job seating the bead, took a lot of inflating, deflating, hitting, heating and soaping. Got there in the end but these tyres were a swine to fit. I think the rough cast wheel surface doesn't help but the tyres are very tight/stiff and since the wheels are so narrow there's not much wiggle space, plus dealing with the tube doesn't help.

Maybe them being tubeless tyres makes them a tighter than ideal fit?

Anyway all fitted now and ready for some decent weather... 
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 01:00
The cast wheels are always absolute complete s0dding barstewards to get tyres on and off of - last time I gave mine to the bike shop over the road to do, he came within a gnat's whisker of giving up. So he told me when I went back to collect and pay.

The reason is because there's like a shallow slot for each tyre bead to drop into - not obvious but there - I always thought the idea was so the beads don't come loose and the tyre flop about if you get a puncture. But a nightmare to get them out, and new ones to go in, all the way around. First time I did it for the Spada nearly broke the footpump with so much pressure, trying to get them to pop on. And despite pints of soapy water, WD40, or anything else I could find as a lubricant.



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Post Options Post Options   Thanks (0) Thanks(0)   Quote ranton_rambler Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 08:54
Yes, they are tricky. I don't do my own tyres except on the kids' old 125. My MOT man does them, and also does a lot for Nigel at NBS. He says it's the design of the wheel.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote chilly Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 08:58
My how my local bike shop laugh when i take my Guzzi wheels in for a tyre change LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 09:21
My dad bought me a pair of tyres for Xmas to fit me 750 ,the front was easy but the rear tyre was so difficult with the 16 inch tyre never again will I do it when Twiggers only charge pocket money to fit
1100 sport corsa , Yam R1, guzzi 650tt rider
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ianboydsnr Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 09:56
Guzzi tyres are always difficult to remove and replace, I have had them up to 90psi to seat, and even then it takes them to be blown up and let down a few times,

I wouldn't like to try and fix one out on the road, that's why I take a can of the foam repair when touring.
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Dukedesmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 13:09
Originally posted by Mike H Mike H wrote:

The cast wheels are always absolute complete s0dding barstewards to get tyres on and off  

Indeed, the rear tyre wouldn't quite seat for about a third of the circumference on one side only. When I spun it round it was about 8mm lower for part of the way as it hadn't 'climbed' onto the bead.

I used loads of soap but still it wouldn't go even with full pressure from my compressor - about 100psi and it won't go any higher as there is a 'blow-off' valve even if I override the electrical cutout.

I ended up slopping even more soap into the gap (when deflated), turning the heat up in the workshop until it was tropical, inflated to 100psi then using one of those cigarette lighter powered compressors from a car which although slow don't cut out and claim can do 300psi, but take forever to get any air in.

I left it as long as I dared (they get very hot) until I had 130psi and it still wasn't seating, so I left it at that pressure and temperature. When I went back to check it 4-5 hours later it had finally seated and it stays there when set to the correct pressure.

Now I've just got to mop up the liquid soap that's oozing out the valve hole.

I can confirm that they are absolutely the worst wheels to fit tyres to that I've ever come across, I hope these tyres last a long time...
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jmee54 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jmee54 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 13:58
When I did the tyres on my Ambassador one, I can't remember which, was a right swine to get on. I pinched the inner tube so had to replace it and even using rim protectors I manageg to mark the rim. It just didn't want to go on, it was so stiff, even warmed. It didn't seat correctly either, so it was a case of deflating it till it was softish and bouncing it around  the yard till it was right. Damn good excercise, even if infuriating.
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Dukedesmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 16:39
To contrast, I've just changed the rear on my 916 which was an absolute walk in the park by comparison.

I used the cable tie method, as it saves levering on the rims and is really easy, just fit 7 large cable ties around the tyre and squash it and tighten until it's small enough to get off/on by hand (tip; if you want to save on cable ties you can cut the old tyre off but, from experience I've found it takes longer as it's tricky to cut through the bead without damaging the wheel).

Hardly needed any tyre soap and the beads seated at less than running pressure, took me less than an hour start to end including a good cleaning (inside and out) of the wheel and touching up some paint chips.

Just to add; I can't get over how heavy the Guzzi wheels are, the rear wheel (5.5"/180 tyre) of the 916 weighs about half that of the Guzzi (2.15" wheel/110 tyre) although, to be fair the 916 wheel doesn't have a disc attached.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 16:42
For tubless tyres I take inner part of valve out to seal to rim then refit and blow up again
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red leader one View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote red leader one Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 20:08
A shop I used to use put the tyre in the shop window .
The sun warmed them up.
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jmee54 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jmee54 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 21:02
Can you use the cable tie method with tubed tyres?
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Dukedesmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 21:35
Originally posted by jmee54 jmee54 wrote:

Can you use the cable tie method with tubed tyres?

I thought about this but don't really see how it would work?

Plus, on the LeMans at least the tyres were so stiff and narrow that I don't think it'd be easy anyway - it is easier with wider tyres as they are much more compliant and so will 'bend' right under themselves. 

This went on just by hand;


5 minutes later;


And, given we're on Guzzi site, here's a mid-change pic;


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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2017 at 21:50
Originally posted by Dukedesmo Dukedesmo wrote:

Just to add; I can't get over how heavy the Guzzi wheels are, the rear wheel (5.5"/180 tyre) of the 916 weighs about half that of the Guzzi (2.15" wheel/110 tyre) although, to be fair the 916 wheel doesn't have a disc attached.


Yes and that's another thing...




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