Brake drum dimension: could anyone please check

[Klaus Schlueter]

Hi all
when fitting my bolt on wire wheels two years ago I found out that the hub touches the outer rim of the brake drum (see pic 1). I bought the drums from Paddock some years ago.The problem was solved by making a 3 mm spacer which you can see in pic 1.
I would like to find out wether the wheel hub or the brake drum is wrong. If you have an old drum to hand could anyone -or better several- check the marked 8 mm from the casting to the machined surface please (see pic 2)?

Many thanks.
Klaus
K1600_Spacer 5.jpgRear Brake Drum.jpg

[DJT]

Hi Klaus. I've just taken off a rear wheel and measured one on my car at 7mm. The drums on minelook original. A job for this winter is to fit new drums and shoes.

Dave

[Klaus Schlueter]

Really no one else with help?
Klaus

[Peter924]

Really no one else with help?
Klaus

Hello Klaus,

I could check this next week as my wired wheels come off again than.
Thats because my rear brakes are still not working ok after overhauling them.
For now 2 pictures of my righthand brakedrum with and without wirewheel adapter.

Triumph Stag AM-51-34 remtrommel_01_mail.jpgTriumph Stag AM-51-34 remtrommel_03b_mail.jpg

[Klaus Schlueter]

Many thanks Peter, that would be very helpful.

Klaus

[StokeyStag]

Hi Klaus,

Just checked a drum this morning and 8mm is measurement -

IMG_0771[1].jpg

Of course, after Brexit this will revert to 0.31496"

Regards,

Mark

[davidf]

Varies from 8.5mm to 7.2mm depending on whether I rest the straight edge across the cast writing on the drum (8.5), or between the writing (7.2).

[Klaus Schlueter]

Thank you very much Dave, Mark and David for your efforts.
The 8 mm (0,31496" ) I found on my brake drums is more or less what you measured. So the hubs of the MWS bolt-on wire wheels seem to be wrong as I was not able to fasten the rear wheels to the brake drums w/o my spacers. Very dangerous!

Klaus

[dasadrew]

....
Of course, after Brexit this will revert to 0.31496"

Regards,

Mark

Don't you believe it, it'll be 41/128ths of an inch or the likes!!

[brian0443]

Good evening Klaus
I have been away for a few days and just saw your thread this evening. I too have bolt on wires from MWS. They were on the car when I bought it thirteen years ago. I do somewhere have a receipt from MWS which shows that the wheels were delivered with appropriate spacers. Mine are tubed type, whilst yours should be tubeless.
The engraving on the rim states Made in India under licence from Dunlop 9 0 10 WIL 5 1/2 J X 14 FHXW 716 D90.
The newer type on the MWS web has the code BXW 716.

I can, if you wish, remove a wheel, and measure the spacer.

Brian

[StokeyStag]

Don't you believe it, it'll be 41/128ths of an inch or the likes!!

Actually, it's 3937/12500ths - well, there's not much on TV

[Kithmo]

Don't you believe it, it'll be 41/128ths of an inch or the likes!!

or 0.01749777778 cubits.

[davidf]

Don't you believe it, it'll be 41/128ths of an inch or the likes!!

Drew
I am disappointed in this lacking your usual precision; actually 40.31496/128ths
Mathematically odd that it ends in .31496 again!

[new to this]

Actually, it's 3937/12500ths - well, there's not much on TV

welcome back not sean you on here lately

[Klaus Schlueter]

Hi Brian, sorry for my late reply, I was out of town.
That is really an impotant input for me. Many thanks for that. Brian, apicture of the spacer and a copy of the ivoice would be very helpful. you ca use my email address.

Yes my bolt on wire wheels are of the tubeless type XW716-3. Neither the TR Shop where I bought the wheels nor MWS who supplied them did mention the necessity of a spacer nor did they supply one. And the MWS website doesn't say anything about a spacer although the wheels are specified for Stag and MG.
That was really a dangerous situation for me for some hundred of km as I was not able to fasten the wheels correctly to the brake drums. I noticed a spongy feeling fom the back axle and it took a while until the loose hubs marked a cicle on the brake drum rims. As my brake drums were new I thought they were wrong. But now I know better!
Here is a pic of the wheelhub/ brake drum situation with my spacer.
IMG_4893.jpg
Cheers Klaus