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#303856 - 03/18/10 10:50 pm Wheel rim widths [ WM2/ WM3]
WayneJ Offline
BritBike Forum member

Registered: 02/10/10
Posts: 12
Loc: IL,USA
Hi, Can anyone verify the wheel rim widths for the WM2 and WM3 wheel rims ?
I believe that the WM2 is 2.5 inches wide and the WM3 is 3 inches wide , is this correct? Thanks

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#303859 - 03/18/10 11:16 pm Re: Wheel rim widths [ WM2/ WM3] [Re: WayneJ]
John Healy Offline


Registered: 03/24/05
Posts: 8633
Loc: Boston, Massachusetts
Rims:
WM2 inside 1.85" (47mm) outside 2.72" (69mm)
WM3 inside 2.15" (55mm) outside 3.080" (78.2mm)
hth
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#303860 - 03/18/10 11:17 pm Re: Wheel rim widths [ WM2/ WM3] [Re: WayneJ]
J. Charles Smith Offline
BritBike Forum member

Registered: 07/23/06
Posts: 916
Loc: Westminster, MD, USA
On the inside, where the tire seats (the critical width), I recall WM2s as being 1.85" wide and WM3s as being 2.15" wide. The outside width will vary between brands.

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#303861 - 03/18/10 11:17 pm Re: Wheel rim widths [ WM2/ WM3] [Re: J. Charles Smith]
J. Charles Smith Offline
BritBike Forum member

Registered: 07/23/06
Posts: 916
Loc: Westminster, MD, USA
Damn, JH is quick at those keys!

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#303877 - 03/19/10 1:31 am Re: Wheel rim widths [ WM2/ WM3] [Re: J. Charles Smith]
dirtymartini Offline
BritBike Forum member

Registered: 07/27/09
Posts: 416
Loc: Harveys Lake, PA. USA
How wide of a tire can be mounted on a WM2?
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#303879 - 03/19/10 1:47 am Re: Wheel rim widths [ WM2/ WM3] [Re: dirtymartini]
Shades34 Offline
BritBike Forum member

Registered: 05/06/09
Posts: 145
Loc: MN

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#303890 - 03/19/10 2:46 am Re: Wheel rim widths [ WM2/ WM3] [Re: Shades34]
WayneJ Offline
BritBike Forum member

Registered: 02/10/10
Posts: 12
Loc: IL,USA
Hi All, Thanks for everyones reply , it appears I have a WM2
rim on the back of my 64 Bonneville and one of the previous ownwers monted a 4 inch rear tire and removed the security bolts , maybe they couldn't fit them back in with the oversized tire. I am going to replace the tire with a 3.50 and replace the security bolts.
Thanks,
Wayne

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#303979 - 03/19/10 7:47 pm Re: Wheel rim widths [ WM2/ WM3] [Re: WayneJ]
Stuart Online   content
BritBike Forum member

Registered: 06/12/02
Posts: 6038
Hi Wayne,

Originally Posted By: WayneJ
I am going to replace the tire with a 3.50

You might want to take a look at the recent "Cheap Tires" and "Replacing Tires" threads on the British Motorcycles In General Board. Domiracer sell a 3.50x18 but, like most small Imperial sizes, it's Far Eastern-made.

Otoh, 4.00x18 isn't really "oversized"; if the US-market '64 Bonny wasn't fitted with it originally, Triumph went to the size (with a 3.25x19 on the front) shortly afterwards (albeit fitted on a WM3 rim) on US-market twins and carried on fitting 'em 'til the mid-1970's. Also, those are the two Imperial sizes available in modern tyre ranges from premier makers like Avon and Continetal.

Otoh2, you could consider a 100/90x18, which is about as wide overall as a 3.50x18 but has an overall diameter about 1/2" smaller.

Originally Posted By: WayneJ
and replace the security bolts.

In theory, they should've been easier to fit in the bigger tyre? confused Only reason I can think they were left out was the p.o. couldn't deal with 'em. If you do a forum search with keywords like "Rim Lock", you should come up with plenty of advice on how to make sure they aren't a pain during tyre fitting.

Hth.

Regards,

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