6 replies to this topic

[binnsboy]

Hi all

 

Picked up some unusual 12x5" wheels the other day (picture of one of them below) but I'm now struggling to find the correct wheel nuts for them.

I'm hoping somebody can help please.

 

 SDC11911.JPG   48.18K   24 downloads

 

They clearly need a sleeved nut with flat washer - and from what I can tell the holes measure approx. 17.5mm in diameter which I think means I would ideally need 11/16" diameter sleeve/shank nut. Is this correct or would 5/8" (16mm approx.) diameter fit snug enough? or would this be too loose and potentally dangerous?

 

Problem is that 5/8" diameter sleeve nuts of roughly the correct length are readily available (Grayston engineering SN21) - but the only ones I can find that are 11/16" diameter are the revolution type (Grayston engineering SN27) and the sleeve/shank is much too long (30mm). Can the sleeve/shank be cut down to the correct length (19mm / 3/4" approx.) so that it is flush with the back of the wheel? Is this good practice - or are there any safety issues with doing this?

 

So the basic questions after all that waffle are:

1 - can I safely use a 5/8" dia sleeve nut? ......or

2 - should I use an 11/16" dia sleeve nut and shorten the shank/sleeve?

3 - is there any other option??

 

Many thanks in advance.

 

cheers

 

Binnsboy

 

[benjy_18]

No idea if this will help, but have you considered the mini special (exacton) wheels nuts?

[surfblue63]

The shank diameter has to fit the hole snuggly. Do not fit the smaller diameter shanked nuts.

 

These guys do all sorts of nuts. I got the nuts for my old D1s from them.

 

http://www.speedshac...k/Wheelnuts.htm

[binnsboy]

Thanks Benjy_18 but I don't think the exacton nuts are either the right diameter or length of shank for these wheels.

Surfblue63 thanks for the link - I may contact them for some advice.
Just out of interest how snug should they fit? I take it there should be no movement whatsoever?

Cheers

[surfblue63]

They should be snug but not tight, you obviously need them to rotate freely to tighten them up.

 

If your measurement of 17.5mm is correct then 11/16" is what you need.

 

17.5/25.4=0.6889 (25.4mm = 1")

 

11/16=0.6875

 

5/8=0.625

[Captain Mainwaring]

You could cut down the sleeve no problem - personally I would do it on a lathe to make a neat job....

 

Rule of thumb is to have at least the same amount of thread engagement as the cross section of a bolt. 1/2" by 20 TPI would be 10 etc.... Other words, 1/2" bolt = at least 1/2" in the hole....

 

These are 3/8"....so you want 10mm at least. That's for pull strength, not sheer.

[binnsboy]

Thanks for your help guys - much appreciated.

 

From your calculations surfblue63 (which are pretty close to mine) it looks like the revolution 11/16" diameter nuts are the ones I need - although the only way to know for sure is to buy one and check the fit. I have a feeling it will be quite tight, but my measuring might not be that precise!

 

And going by your rule of thumb Captain Mainwaring, if I cut the shank down to fit the hole in the wheel - this will be in keeping with your ratio of thread to cross section (19mm length to 17.5mm diameter) - if I've understood you correctly?

Should the length be just fractionally short of, or flush with the back of the wheel?

 

If this fits then I'll just have to find a way to cut them down - at the moment the only thing I have at my disposal is a hacksaw!

 

On a side point, Captain Mainwaring - would you mind explaining in layman's terms the difference between pull strength and sheer?

 

cheers