Bolt on Spacers - are they legal?

[StuyMac]

Looking at fitting some spacers and rather than fit the regular type with loger studs Ive been considering bolt on spacers.

The blue book mentions nothing about this type of spacer, and only says the max thickness is 25mm, you cant use multiple / laminated spacers and stud extensions are not allowed.

Anyone confirm wether I can use them or not...

Heres a pic of what Im on about...



..rather than the traitional type...

[jellison]

No idea.

But is this to change from one bolt pattern to another? (I presume not but pls say).

I would always fit high tensile longer bolts into the original hub. Seems an odd thing to do.

Is it all disc and easy to get them bolted on or if drums on the back harder to get these on and / or longer studs.

[StuyMac]

No, its litterally to space the wheels out.

Ive done a bit of research and they are OK

From what Ive read they are also safer than the alternative. They bolt on which essentially makes them more a part of the hub than the sandwich type and as the studs are shorter there is less chance of them stretching and less load is applied on them.

As they bolt on they also stay put when you take wheels on and off

[jellison]

Seems alot of effort when the old fashioned way is tried and tested and you can just changed to different spacers at will (but there is and IF) and that means you do have to have longer studs installed in the first place which is often not as easy as you'd think (easier on disc end, but can be a big job on the drum end, if you run rear drums).

What is it on? You could use different off set rims but obviously that is expensive too.

[Scuffers]

they are a lot safer...

the plain spacer type in the pic is only usful if the nose of the hub can reach though it to the wheel, wheels are supposed to be supported on the nose of the hub, NOT the studs.

with wider spacers this is never going to happen, hence the use of spacers that bolt on, they sit on the nose, and then present a new nose to the wheel.

[mat205125]

Can't see your pictures as they just come up as little red crosses, however would work on the principle that states:

"Unless your regs say that you can do something, you should assume that you cannot"

[JonnyW]

Whilst the Blue Book is there to protect us most racers tend to go one step further and make sure we are happy with the car and technology and exceeding the book's spec as the miminum standard is a good thing. My concern would be that you are bolting on to a bolted on item (two sets of stressed bolts)that looks and I may be wrong, like an ally plate with steel studs and fixings. If it was a solid steel plate I'd be happier but this would weigh too much and what's the point if you can do better with an ally spacer?

At the end of the day the forces on the corners are massive as well as the heat, frankly I wouldn't chance it. I run spacers on my A Series Modified Frogeye but on the TVR that runs at 430 bhp Compomotive have made me a couple of sets that run offsets (that were not expensive in light of the total cost) and make sure the barings are looked after etc..

Edited by JonnyW on Tuesday 24th February 00:03

[jellison]

JonnyW said:

Whilst the Blue Book is there to protect us most racers tend to go one step further and make sure we are happy with the car and technology and exceeding the book's spec as the miminum standard is a good thing. My concern would be that you are bolting on to a bolted on item (two sets of stressed bolts)that looks and I may be wrong, like an ally plate with steel studs and fixings. If it was a solid steel plate I'd be happier but this would weigh too much and what's the point if you can do better with an ally spacer?

At the end of the day the forces on the corners are massive as well as the heat, frankly I wouldn't chance it. I run spacers on my A Series Modified Frogeye but on the TVR that runs at 430 bhp Compomotive have made me a couple of sets that run offsets (that were not expensive in light of the total cost) and make sure the barings are looked after etc..

Edited by JonnyW on Tuesday 24th February 00:03

Yep - I said this right at the start - spacer and longer high tensile studs is what 99% of people use and have used for Donkeys.

I would not go down this route, just sounds odd / daft / pointless - take your pick.