Akront Rims on 1976 Commando Mk3

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Akront Rims on 1976 Commando Mk3

Postby Robin1 » Sun Apr 18, 2010 8:44 pm

My new (to me) Commando Mk3 Interstate has Akront alloy rims. The rear tyre needs replacing and I'm unsure of the type of modern tyre that I can fit. The existing tyre is a Metzeler ME1 120x80 VB18 and the rim is stamped 2.50-4-S-296E.

Presumably an 18 inch 120/80 Avon Roadrider (AM26)will fit. .

Any advice on whether that will be Ok or any other information about a suitable tyre appreciated.

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Re: Akront Rims on 1976 Commando Mk3

Postby L.A.B. » Mon Apr 19, 2010 7:01 pm

I think members of the Jerry Doe Access Norton (Norton Commando) website forum http://www.accessnorton.com/ who have AM 26 Roadriders, usually use the 100/90 size on the rear, either in the original 19" diameter Commando rear wheel size, or 18" diameter if the rim has been changed to allow a wider choice of rear tyres. I think a few Access Norton members experienced some handling problems with wider rear tyres if I remember correctly.

A 2.50 rim size is a bit narrow for a 120/90 tyre, and the Avon Roadrider rear fitment recommendation for an 850 Commando is either 4.10 or 100/90 (in the original 19" size) on a 2.50 rim.
http://www.avon-tyres.co.uk/motorbike/8 ... r-commando
http://www.avon-tyres.co.uk/motorcycle/roadrider

You can always use the search facility on the Access Norton forum to find more information on this and any other Norton Commando related subject (and why not become a member too?) and here's a recent discussion about this subject: http://www.accessnorton.com/avon-tires- ... t6122.html
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Re: Akront Rims on 1976 Commando Mk3

Postby Robin1 » Sat Jun 05, 2010 7:37 am

Thanks L.A.B

I eventually went for the 120/80 Avon Roadrider but found, when I took the wheel off, that both hub bearings were shot. Took some time to get the new bearings and seals (Andover-Norton and Norvil) but the end result is much improved handling. No doubt some of that is bearings but the tyre feels secure on most surfaces.

Next problem is the front brake which is poor. It has a non-standard AP Lockheed caliper for which I can't find a part number or a supplier for pads.

Thanks,

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Re: Akront Rims on 1976 Commando Mk3

Postby L.A.B. » Sat Jun 05, 2010 2:11 pm

Robin1 wrote:Next problem is the front brake which is poor. It has a non-standard AP Lockheed caliper for which I can't find a part number or a supplier for pads.


Can you give any more details about the caliper, or some photos perhaps?

The main reason the Commando disc brake is poor (by modern standards at least) is because the hydraulic ratio between the master cylinder and caliper is not ideal. So to improve the brake you need to replace the original 5/8" (15.87mm) piston diameter master cylinder unit with one which has a smaller diameter piston of around 12-13mm (Andover Norton sells one wich uses the original switchgear but it's not cheap), or get one from a breakers? Or the original master cylinder can be sleeved down to 13mm (RGM Motors do this) as then the original handlebar switchgear can be used.

http://www.nortonmotors.de/ANIL/Accessories.htm
http://www.rgmmotors.co.uk/
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