MSA regs on Wheels spacers - help!

[Duke Thrust]

I'm building a Triumph TR7 for Hill-climbing and am tying myself in knots over the MSA regs

5.8.2 states:

Not be fitted with any wheel spacer exceeding 2.5cm in thickness or of less than hub diameter. Multiple or Laminated Spacers and extended studs are prohibited.

Couple of questions on this, you can't have a spacer thicker than 2.5cm, understood. "Or less than hub diameter"?? So it can't be less thick than the hub??

I feel there's something fundamental here I'm being thick about an not getting...

Also: Multiple (understood) or laminated - what's a laminated spacer??

I'm taking extended studs to mean longer or welded to make them longer??

Long story short, I want to use 8" rims (instead of 10", tyre prices...) on my works bodied TR7 and need to push them out in the arches to fill. I'll need a spacer about 20mm so was thinking about a hub-centric one like this:



But am not sure about the wording and how it applies. Anyone had experience of this? Any scrutineers care to share their wisdom?

Thanks!

[Duke Thrust]

marshalla said:

On the first bit - I read it as spacers can be no more than 2.5cm thick and must have a diameter which is at least as big as the hub's.

Ha! Yes, I understand that bit now, thanks!

Christ, sometimes it just takes someone else to word it slightly differently.

Right, who can help with the next bit?

[Duke Thrust]

NJH said:

20mm hub centric, knock the studs out of the hubs and replace with longer ones. Pretty much every 944 or 968 race car I know of over the past 10 years or so has run a setup like that so I suspect many other types of cars they have been doing similar to maximise track widths.

Yes, I think I'll go down this route.

The more I read extended studs the more I think it means studs that have been made longer (welded etc) as opposed to studs that are longer to begin with.

I've already got 2 sets of wheels to use, hence why I'm not ordering them with different offsets to begin with, only need to adjust the rears.

[Duke Thrust]

Thanks for that, yes you're absolutely right, look:



Okay, that must be what's meant by extended studs or it'd say extended or longer