Avon tyres... bummer...

Fast Eddie

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Am I missing something in this link:

https://www.avontyres.com/en-gb/tyres/roadrider?cartype=motorcycle

Looks like Avon have dropped the imperial sizes for RRs. Meaning that my favoured combo of 19” front (universal) and dedicated 18” rear, that have the same rolling radius, are now defunct.

As is the 19” universal.

And the dedicated rear 18” that would fit in a Commando.

The 110 / 18 that they do is a universal, which has less tread depth than a dedicated rear and this a much reduced life.

Looks like they’ve tried really hard, and succeeded, in making RoadRiders a shit choice for Commando owners (and a whole list of other classic bikes) !

Can someone please remind me what the options are elsewhere, the Continentals are popular with some of y’all if I recall correctly...
 

maylar

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Wasn't there a thread here a bit ago about the new version of those coming out soon?
I'm still seeing AM26 universals being listed.
 
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Coincidentally I am about to order two tyres to replace my old road runners

I have measured the actual worn tyres on my Commando:
  • Front 90/90/19 actual width 95mm & diameter 646 mm fitted to Akront 1.85"
  • Rear 110/90/18 actual width 116mm & diameter 658 fitted to unknown rim
Obviously the rim affects the width & height of the tyre, but it would seem I previously chose tyres with different diameters
with the rear being "taller" than the front, which is presumably not good?

Although on radius the difference is half 323mm (front) vs 329mm (rear) and as the rear wears it will become closer to that of the front.

On the newly revised Avon web site perhaps the better (?) choice is
  • Front 90/90/19 spec width of 99mm & diameter of 647mm
  • Rear 110/90/18 spec width of 111mm & diameter of 640mm
This gives the rear radius (320mm) as "lower" than front (323mm) which is opposite to my current tyres and as it wears the rear will become lower.

Or perhaps I should have a pint of fine ale and stop worrying about a few mm

Perhaps after Brexit we can have proper Imperial tyres and proper pints instead of 500ml:)
 

Fast Eddie

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Bridgestone BT-45...
https://www.bridgestone.com/products/motorcycle_tires/products/detail/pr015/

I'm running these on a Kaw H1. The tires along with some suspension work transformed the Evil machine.
Would not hesitate on a Commando.

Not sure what sizing you are looking for but they have the 400/18 and 325/19 sizing if you prefer. They don't match however.
Thanks for that, very informative.

For those of a 19” front and 18” rear configuration (like me), the following looks like a good set up, which should be fine so long as you keep below 130mph...


Front: 100/90-19 M/C 57H W (it has a diameter of 663mm)
Rear: 110/90-18 M/C 61H TL (it has a diameter of 658mm)
 
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MichaelB

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Your Welcome.
That's the combo I am running on the H1. I like them ALOT......
In hindsight, I question whether I should run the 400/18 on the stock rim, decreasing the trail a tad.
(Edit, I remember now, not available at the time)

The 110/90-18 is 658 BTW. Typo I'm sure....
 
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MichaelB

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Yup, but he's on the short list of those who could exceed it.....
 

illf8ed

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I see Roadrider II 100/90-19 on Avon’s website. That’s what I use front and back on my ‘72.
 

Fast Eddie

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I see Roadrider II 100/90-19 on Avon’s website. That’s what I use front and back on my ‘72.
And now that they no longer do a suitably sized dedicated 18” rear, your set up would appear to be as good as any.
 

illf8ed

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I have a new set of 100/90-19 AM9 that came with my new ‘69 750 S project. Will use these when the Roadriders are worn out. The ‘69 is going to get Avon Safety Mileage/Speedmaster tires of the correct size, 100/90-19 fouls the front fender. The rear Safety Mileage has a tread pattern very similar to Avon GP that was original equipment.
 

dero

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another vote for the bridgestone BT45's .
Have had these the last 3 times , very happy with them .
 
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Hi Eddie,

I'd be interested to know why you do not seem to like the Avon Roadriders:

Front Mk1 90/90/19 99mm 647mm
Front Mk2 90/90/19 99mm 647mm

Rear Mk1 110/80/18 111mm 640mm
Rear Mk2 110/80/18 111mm 640mm
Rear Mk2 100/90/18 108mm 642mm

They all seem to be smaller in diameter than the original tyres and the other tyres you are contemplating,
is this the reason?

Thanks
Staytite
 

Fast Eddie

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Hi Eddie,

I'd be interested to know why you do not seem to like the Avon Roadriders:

Front Mk1 90/90/19 99mm 647mm
Front Mk2 90/90/19 99mm 647mm

Rear Mk1 110/80/18 111mm 640mm
Rear Mk2 110/80/18 111mm 640mm
Rear Mk2 100/90/18 108mm 642mm

They all seem to be smaller in diameter than the original tyres and the other tyres you are contemplating,
is this the reason?

Thanks
Staytite
Only one reason. All of those rear tyres you show are not rear tyres, they’re universal fitment.

They therefore only have 5.6mm tread depth. A dedicated rear tyre has 34% more depth at 7.5mm.

Thats 34% more mileage... and less cost... and less tyre changing aggro.

Being nice and sticky, Roadriders don’t last too long anyway. I just find it frustrating to have to change them EVEN more often just cos it suits Avon!

With a shed full of bikes, reducing the cost and aggro is nice...
 
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