SOHC.co.uk Forums > CB500/550

2.5 Rear Rim Fitment?

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woody928:
Hi All,

If I'm having my wheels rebuilt and getting new rims at the same time, and I'm planning to go wider to accommodate more modern rubber.

I've got 3.25 - 19 and 4.0 - 18 Avon Roadrider Mk2 Tyres. Looking at Avon's websites I really want wider rims for better fitment.

I'm planning to go up to a 19 - 2.15 rim up front, and would like to go up to a 18 - 2.5 on the rear. Will the rear wheel clear the frame and chain etc at 2.5? I think it will but would love some confirmation before pulling the trigger. 

Many thanks in advance

Trigger:
For a 3.25 tyre, you would require a 1.85 rim which can take up to a 3.50 tyre. And for a 4.00 tyre you will require a 2.15 rim. The clearance problem is not the frame its, the torsion bar  ;)

woody928:

--- Quote from: Trigger on July 14, 2020, 07:54:54 AM ---For a 3.25 tyre, you would require a 1.85 rim which can take up to a 3.50 tyre. And for a 4.00 tyre you will require a 2.15 rim. The clearance problem is not the frame its, the torsion bar  ;)

--- End quote ---

Looking at Avons website for these tyres it’s suggesting bigger rims, seeing as I’m going custom anyway would it not be advisable to follow the manufacturers specs?

Assuming the above quoted sizes would fit that is? I know that combo your quoting would work on the minimum reccomended widths but I thought I should go for the optimum setup given the choice, no?

Would I run into issues with a 2.5 rear rim?

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

Trigger:
Can not see any mention on fitments to any SOHC's on the Avon site  :o
 With 2.15 rim and a 4.00 tyre, you only have a 10 to 15mm clearance between the tyre wall and the torsion bar. Any wider on the rim the tyre wall will be wider when inflated  ;)

Johnwebley:
I doubt the mods will improve the handling.

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