New tyres for my 72 Commando

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Madnorton said:
For our German members, I have attached the PDF. From Cooper tyre, Germany.
Click to expand...

Actually, that says that mounting on a 1.85 is “possible”.

They say “permissible” for 2.15-2.75 and presumably 2.5 is still their main recommendation.
 
Yes, it is 'allowable' according the the German owner who contacted Cooper tyres Germany to get the response above, and thus why he will fit Roadriders. And this can be done under the ETRTO guidance in Europe. All tyres by nature of design will fall into a band of recommended widths, but manufacturers can approve additional rim widths for their products ie 'possible or allowable' depending on translation. What is becoming more of an issue is that some tyres despite being able to be fitted to the recommended rim width, they can't be fitted to certain rim types. Not so much of an issue for the classics, but some high end bikes it is now being seen more often.

As for the ETRTO, the guidance also says, fit tyres as approved, or equivalent size and rating, by the vehicle manufacturer - which is a bit of a get out jail card for them. Despite what Norton specified in the 70's I doubt there is now any tyre in the sizes that is recommended for the WM2, other than the Roadrider, if you believe the Cooper tyres response above.
 
colin davie said:
my roadriders i was told to run at 29/30 psi front and rear ,
what is the general opinion ?
Click to expand...

That’s the right ball park I’d say. I go for 28/32 but have tried a few psi more and less without any noticeable difference.
 
I'm wondering what Tornado thinks of those Shinko tires because I considering plopping a set on my old Goldwing for bashing it about on short runs. I don't really want to spend a wad on new Dunlops until I know how the old bike is going to stand up after 22 years of sleep. The price is right for experimenting providing they don't peel off like skin on a potato.

Sorry to jack a portion of your thread OP, but I know of no one else that's run them.
 
TT 100’s, I thought I had a wheeze for getting them half price. They didn’t fall for it last time. Fronts last a long time, wear on the right side due clockwise roundabouts. Rear squares off fairly quickly then gets twitchy over white lines, which might be unsettling for some, those of us who ride dirt bikes would not be fazed. I have what insurance companies call client inertia when it comes to tyre change out time.
I leave serious lean angles for the track.....though I do have a couple of favourite bends ;)
 
jbruney said:
I'm wondering what Tornado thinks of those Shinko tires because I considering plopping a set on my old Goldwing for bashing it about on short runs. I don't really want to spend a wad on new Dunlops until I know how the old bike is going to stand up after 22 years of sleep. The price is right for experimenting providing they don't peel off like skin on a potato.

Sorry to jack a portion of your thread OP, but I know of no one else that's run them.
Click to expand...
The shinko 705s are my second set on the bonneville. First set only went 2k KMs...before they couldn't handle a policeman's spike stripe being pulled out across the road while going 100 kph. Fresh set has just done about 10k KM's on a cross Canada ride. Still good to go but just beginning to see some squaring on the back. Longevity shouldn't be such a great concern due to lower price point (think it was about $100 CAD per end delivered to my door). So swapping then every other year is quite reasonable if needed. They seem to go well on dirt gravel and wet pavement.
 
Tornado said:
The shinko 705s are my second set on the bonneville. First set only went 2k KMs...before they couldn't handle a policeman's spike stripe being pulled out across the road while going 100 kph.
Click to expand...

Whoa, whoa, whoa. That story needs a separate post. See you at the pub?
 
Madnorton said:
Not so fast, Avon now approve the WM2 for the 100/90 - 19 Universal. The constant badgering of them seems to have got across to them, seems it was just an oversight after all these years.
Click to expand...
Do a contact profile to check the difference in road contact between wm2 and 2.5"width rims. And I have.
 
Nobody mentioned the tires performance when hitting grooved pavement which is even more common now. My bike with K81's was a bit scary on the grooves. This can be especially fun if one runs with a bit much flop in the isolastics. When I changed to the more modern stuff, groove wobble was a thing of the past. I would not go back to TT's or K81's.
 
Just because one is bigger than the other means nothing or the smaller one is outside of design requirement. Have you asked Avon what size the contact patch should be. Much of the modern rubber comes with many improvements, along with manufacturers warnings not to reduce tyre pressure in the wet to increase the contact patch size as the tyre design will not disperse water adequately.

I suspect a power to contact area ratio for modern bikes would make our Nortons contact patch no matter what rim it is on look very adequate and hardly challenged.
 
Well, as you’ve said before Ash, Avon do now seem to say that this tyre is acceptable on a wm2 rim.

But they also say that the recommended width is a 2.5” rim. So, that’s clearly the rim that they think works best.

They have not amended their web site yet, it still says the min width is 2.15” which is a wm3.
 
I still like the TT100's on my Commandos. I rotate the front to the rear and keep fresh rubber on the front. I have used RR's, and they are OK. I have them on my GT750 Ducati.
 
As said I run TT100's. They're chewing up my favored cruising road stripping & grooving in prep for new blacktop, and all I've got to give on TT100 and grooved pavement is that there be devils in abundance. Twitching, squirming, & no joy in navigation.... Add that to the gentle nuances of an isolastic mounting system and it gives little comfort to my ride forcing me into wanting to get it over with. Everything holds together & does as it should, but it's not a smooth marriage. Worrisome is more adequate.
Velocity & G forces are far less than desirable on a Norton. ie; normal grooved performance in my opinion.
 
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