boranni rims

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sean

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anyone know what the correct rim numbers would be for a 1968 fastback .....I am looking at a set of Boranni rims but not sure if they are wide enough they say WM 2
thanks
 
As well as being WM2 they also need to be drilled correctly for the spoke pattern.
 
given the chance to re-hoop, isn't it commonly held to go a bit wider (than original) on the rear?
 
you will get many opinions on rim and tire sizes, personally i think tires such as originally fitted Dunlop 4-10 K81's on the rear is a perfect choice, wider does not guarantee better handling and in fact will more than likely detract from the current handling.
 
sean said:
anyone know what the correct rim numbers would be for a 1968 fastback .....I am looking at a set of Boranni rims but not sure if they are wide enough they say WM 2
thanks
Click to expand...

Are you asking for rim size or rim part number? Original rims were WM2-19 Jones or Dunlop chrome plated steel. Borrani alloy rims were never original so there is no part number.

I believe it is best to fit the rim to the tire you want to run. Original type front tire is an Avon Speedmaster 3.00-19 which Avon recommends a 1.85 inch wide rim (WM2). Rear would be a 3.50-19 Safety Mileage which Avon recommends a 2.15 inch (WM-3) but lists a WM-2 as an alternate.

A 4.10-19 Dunlop K81 was fitted to later Commandos on WM-2 rims. However, a 4.10-19 won't fit the narrow early front fender and the 3.60-19 fitted to many early 'S' models is hard to find.

This leaves the modern AM26 RoadRider in 90-19 and 100-19. Avon recommends a WM-3 for the 90-19 and a WM-4 for the 100-19. Those widths are nearly impossible to find. The 100-19 will fit on a WM-2, but you will never use the entire tread surface. I have a set of 100-19's on WM-3 rims and that seems better, but 90-19's on WM-3 or 100-19 on WM-4 would be better if you can find them and there are no clearance issues with the front fender or the rear chainguard.
 
Ron has it right. Tires first, then rim to fit. WM-2 really limits the choice of tires, especially the rear.
 
in my much younger days I used to fit 3.60 x 19 K81 front and 4.10 x 19 K81 rear on early Commando's. at the time I couldnt of found a better choice, even today i wouldnt hesitate to use same.
 
The Avon Roadrider chart allows that 100/90/19s can be fitted to wm3 rims.
For a wide rear tire with good carrying capacity, their 4.00 x 18 is approved for fitment to wm3 and gives great weight carrying capacity (64rating ) plus almost as much width as the 120/90/18, which does require minimum wm4 rim width.

Glen
 
It is a thing of beauty to see a Commando with standard tires cleave through a tight turn and leave a "super bike" with wide tires in the dust. I also prefer the K-81 tires but do hope that the new tires have the right compounds!
Mikie3117
 
I have a deep and abiding love for K-81s and I probably have more miles on them then on any other type of tire. That said, I tried to continue riding them at a time when the field (including other Dunlops) was leaving them behind - particularly in compound. I must admit however that it has been a decade or more since I last used them.

In their shape and tread design, they were transitional from the old standby K-70 to Dunlop's Trigonic road racing tires. Their K-70 type triangular blocks and wide open areas between the blocks give you more control when you hit a patch of sand but they will wear out quickly overheat and even chunk if you road race them; the Trigonics and then newer tires don't have those dirt road inspired blocks.
 
kommando said:
As well as being WM2 they also need to be drilled correctly for the spoke pattern.
Click to expand...
is there any way to tell by looking at them if they are drilled correctly ?
do you mean the angle or number of holes ?
thanks
Sean
 
Ron L has my vote too. Original fitment on an early Commando is 3.00-19 front and 3.50-19 rear, both WM2 rims. However, most of the early front mudguards must have been binned because they are not available any more and the 3.00-19 is almost impossible to find. I got an Avon SpeedMaster II from Walridge a couple years ago, I should have bought 2 or 3.

I can also say that when I put anything larger on the rear than the 3.50-19, it handled like shit, especially with the narrow front tire. I understand that lots of people now like the same size front and rear and I'm sure it works a treat, but you'll have to change the original front mudguard.

Just my opinion, not a great deal of scientific methodology here.
 
My 1971 Fastback is equipped with Borrani Rims

The nos are|

Rear, Borrani WM2,19,RECORD, RM01 4450/A. Fitted with an Avon 4.10" roadrunner

Front: Borrani WM-2/1.85-19/40 Record/11. Fitted with an Avon 4.10" roadrunner

Seem to be some inconsistencies in the Borrani numbering system! There was a bit of a spat in one of the UK mags about the new Borrani rims, claiming that they are now made in China, and apart from the name and appearance don't have much in common with the originals. Who knows.

When I finally get this bike on the road, I will fit a pair of new Avons, any views on going down to a 3.25 x19 front
 
I got a set of the valanced rims off Madass140 in WM2 sizing for my 71 Fastback,tyres/tires to suit who knows.
I think the sizing these days is all about a optimum rim width to suit modern tyres that are available not what used to be up to 40 years ago,personally if the optimum rim was a 2.15 in I would rather run a 2.5 over a 1.85 even if it is in the usable range.
The RM2's I have will be running razorblades, 90 front,100 rear at the most if something is available,pity Continental do not do the Classic in 19's.
Even the Eldorado (WM3 Borranni's f/r) is a pain,try finding a 120/90/18 whitewall now.
 
I think he was after alloy rims
Click to expand...

He was but that listing shows the hole pattern required in the alloy rim so he can gauge whether it has a chance of fitting.
 
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