SOHC.co.uk Forums > CB500/550

Tyre size

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florence:
I like Avon SM and Speedmaster.  The rear tyre looks square but don't be fooled, can be leaned as far as you like.

Seabeowner:
I've used Avon 100/90 x 19 and 110/90 x 18 on my main 500 for 5 years. Seem about right. Any smaller metric sizes are too small.

Murf:
Thanks for the replies.
I think I am going to go with the 100/90 x 19 front and 110/90 x 18 rear Bridgestone BT 46 tyres.   
 They seem to be close to original size,  the dealer seem to have them in stock and they are well priced compared to other premium makes at the moment. I was also struggling to get the size I wanted with other makes. 

Thanks OddJob for the tip about increasing rim size and using slightly wider tyres if the rims need changing, my rims seem to be pretty good on the outside so I am hoping there is no nasty surprises when the tyres are removed. 

Murf:
Well I thought I would check the rim sizes as stamped on the rims before I ordered any tyres, I have to admit that I had not done that yet.  Well the Sizes are Front 1.85 x 19 and surprisingly the Rear is also 1.85 x 18, it is actually stamped 1.85B x 18, not sure what the B means,  I was expecting the rear to be a wider rim. 
It does seem that the early US 550 was fitted with the 1.85 rear rim.

So does this affect my tyre choice and will I still be able to fit a 110/90 tyre as planned. I really don’t want to go much narrower on the rear.
It really is surprising that someone has put a 120 tyre on this diminutive rear rim.😄

Oddjob:
I ran a 4.25/85 rear tyre on the rear of my 500, paired with a 4.10 front and it was ok until you really pushed hard. Then the tyre wall would start to flex on corners as the rim size just didn’t give enough support.

Most ran 3.60 and 4.10 rears and that seemed to be almost ideal. So around 100 and 110 is the equivalent.

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