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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 Online   content


Registered: 03/24/05
Posts: 8172
Loc: Boston, Massachusetts
Rims:
WM2 inside 1.85" (47mm) outside 2.72" (69mm)
WM3 inside 2.15" (55mm) outside 3.080" (78.2mm)
hth
_________________________
On a Triumph Loctite (blue) MUST be used on THREE FLYWHEEL BOLTS, engine sprocket nut, both nuts on the transmission main shaft (clutch & kick starter ends). When its used, it must be used properly on cleaned surfaces (and primed if necessary when parts are plated).

It should NEVER be used on camshaft nuts, timing side pinion crankshaft nut, bearings, valve guides, replacement cylinder sleeves, replacement valve seats or the flywheel SLUDGE TUBE PLUG!!!!!

"Don't just teach your children to read. Teach them to question what they read." George Carlin

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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: 849
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: 849
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?
_________________________
'69 Norton Commando "S"
75 Norton Commando Mark III
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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: 127
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 Offline
BritBike Forum member

Registered: 06/12/02
Posts: 5458
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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