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#855617 08/07/21 4:09 am
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DavidP Offline OP
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I just noticed that the rear tire on the Bonnie is worn in the center, but only in one section. In that one place the center grove is worn bald, while it's just fine everywhere else. Avon Roadrider.
I removed the chain to check wheel balance. The light spot corresponds with the worn patch. Can't say if it was always that way or if the imbalance is due to that tire wear. I put a half ounce of weight in that spot but it's still out of balance. I've ordered some 1 ounce weights.

BTW: It's starting to get difficult to find the tires I want. The new MkII RRs only come in 110/90x18. I do not wish to mount a wide rear tire, might have to change to 4.10x18 TT100.


Santa Claus wears a red suit, he's a Communist

72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
92 BMW K100rs "Gustav"
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DavidP #855701 08/08/21 4:22 am
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It seems that everyone is out of Road Riders at the moment.
I ordered a K81, even though the site tells me that it's the wrong tire for a '72 T120V. Maybe they still put K70s on the twins? laughing


Santa Claus wears a red suit, he's a Communist

72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
92 BMW K100rs "Gustav"
DavidP #855709 08/08/21 8:04 am
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I had trouble getting Roadriders last year here in Oz. Distributors had none available in the country in the size I was looking for (100/90-18) and I had to wait about 6 weeks until there was a shipment. Just another COVID effect I guess.

I'm about to replace the 100/90-18 on the back of my A65 and it felt really weird the whole time I used it. It felt like the rear of the bike was moving around due to a loose swing arm or something. Wear was even all the way around,.

I just put a couple of thousand kilometers on it on a long trip and it feels fine now, but is worn to the point where the central groove is mostly gone. So its going to the bike shop tomorrow. Hope this doesnt mean that the roadriders are getting dodgy for quality.

Ray


BSA 1969 A65F
BSA 1966 A65H
Triumph 1968 T120
Kawasaki A1R
& too many projects!
DavidP #855742 08/08/21 6:19 pm
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In the UK, Roadrunners are available in 100/90 18 , but expensive.

Will a Speedmaster fit? smile

Edit: unknown forces created a link to US ebay when I typed "Spe edmaster". It wasn't me guv, 'onest.

Last edited by Dibnah; 08/08/21 6:21 pm.
Dibnah #855776 08/08/21 11:38 pm
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Originally Posted by Dibnah
Will a Speedmaster fit? smile

For the rear?


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"


"Every time I listen to AC/DC, so do my neighbors"

DavidP #855790 08/09/21 6:36 am
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Rebadged as "Safety Mileage" for the rear, but looks very familiar to me

[Linked Image from i.postimg.cc]

DavidP #855794 08/09/21 8:13 am
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David, RR MK2 are available in imperial sizes (18-4.00) so you might have to keep an eye out for what suppliers sell them (I put a set on my oif earlier this year)

As for the wear, you haven’t locked the back wheel under breaking at any point have you?


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
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Dibnah #855798 08/09/21 9:19 am
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Originally Posted by Dibnah
Rebadged as "Safety Mileage" for the rear, but looks very familiar to me

[Linked Image from i.postimg.cc]

The SM MkII rear was 'Safety Mileage'. The matching front tyre was 'Speedmaster' (1962 ad.).

[Linked Image from i.postimg.cc]

DavidP #855803 08/09/21 1:44 pm
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My rear tyre wore more on one point of the circumference and this was due to the brake dragging but not all the way round. Over half the circumference the wear gradually got worse to the most worn bit and then tailed off again.

If your tyre wears in the centre of the tread then the tyre is over inflated.

Dave

Last edited by dave jones; 08/09/21 1:46 pm.
L.A.B. #855865 08/10/21 8:39 am
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Originally Posted by L.A.B.
-
-
The SM MkII rear was 'Safety Mileage'. The matching front tyre was 'Speedmaster' (1962 ad.).
-
-

Interesting. I can certainly recall the rear tyre being sold by dealers as a Speedmaster in the previous century, worked ok on farm tracks and grass. I can also recall someone fitting the rear on the front of a solo, which still happens apparently

[Linked Image from i.postimg.cc]

Allan G #855985 08/12/21 4:11 am
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DavidP Offline OP
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Originally Posted by Dibnah
Rebadged as "Safety Mileage" for the rear, but looks very familiar to me

[Linked Image from i.postimg.cc]
I tried one of those on a Trident years ago. The best I can say is that it didn't inspire confident handling, I got the bent pinkie on my right hand to prove it.

Originally Posted by Allan G
As for the wear, you haven’t locked the back wheel under breaking at any point have you?
It is possible that it happened when I lost the rear axle nut a couple of years ago, but I was only doing about 35mph at the time. I only noticed the bald patch a couple of weeks ago.

In any case, my new K81 arrived today. They're made in Indonesia now, just down the road from the rubber plantation. I hope they're as good as they were when they were about the only option for these bikes.
I do kinda wonder how much use the balance dot on the tire is when there are wheel locks involved.


Santa Claus wears a red suit, he's a Communist

72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
92 BMW K100rs "Gustav"

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