Lotus Elan

26R Wheel dimensions

PostPost by: Davidb » Thu Feb 02, 2017 6:32 pm

I thought I would try asking here in the racing section. Can somebody give me the dimensions of the centre part of the peg-drive 26R wheel? I need the diameter of the centre hole at each end and the length of the hole from the rear face to the bottom of the 'cone' at the front of the wheel. Also, are there any locating tapered sections on the wheel? Photos would be nice...
Many thanks, David B
Last edited by Davidb on Fri Feb 03, 2017 2:30 am, edited 1 time in total.
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PostPost by: Bill » Fri Feb 03, 2017 2:06 am

David

I have a 13" leather wrapped Lotus wheel - hub takes standard horn button - the tapered bore is 3/4" to 5/8" over the 1 and 7/8" bore length. No key way but the bore is cerated for grip to the tapered steering shaft. I think this wheel may be from a 26R - just part of my "accumulation" of Lotus stuff

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PostPost by: Davidb » Fri Feb 03, 2017 2:29 am

Thanks Bill. But it is the actual road wheels that I need the dimensions of! I should have been more clear. I am fitting 'Revolution' wheels to 26R hubs and I want to be sure I am not missing some subtle dimension or feature.
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PostPost by: Panda » Fri Feb 03, 2017 5:32 am

Hi David, not sure if my 1st reply got sent, so here goes again. I have measured my Kelsport replica 26R rim and have the following sizes.
Hole size 56.10mm
taper on outside of rim for wheel nut is 70.6 od.
from top of taper to inner end face is 18.6mm
from top of taper to face which contacts hub is 43.8mm
I hope this helps
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PostPost by: Davidb » Fri Feb 03, 2017 5:48 am

Many thanks Alan! Those measurements mean that modifying the Revolution wheels should be relatively easy. My only question is: Is the hole through the centre of the wheel parallel sided? I am fairly sure that the wheel is located by the taper of the knock-on nut bearing inside the taper of the wheel on the outside edge and by the short (15 mm long) section of the hub immediately adjacent to the flange where the pegs go through on the inside edge of the wheel. Does that sound correct to you? A photo of the inside of the hole would be nice... :)

Best regards, David
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PostPost by: Bill » Fri Feb 03, 2017 8:01 pm

Jeez David - that was dumb of me - just goes to prove - when a wheel IS NOT a wheel.

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PostPost by: jabingb » Sat Feb 04, 2017 2:29 pm

Davidb wrote:I thought I would try asking here in the racing section. Can somebody give me the dimensions of the centre part of the peg-drive 26R wheel? I need the diameter of the centre hole at each end and the length of the hole from the rear face to the bottom of the 'cone' at the front of the wheel. Also, are there any locating tapered sections on the wheel? Photos would be nice...
Many thanks, David B

DB,
I've got both a S1 and an S2 rim that I can measure if needed. On an original LightWeight, the rim does not use any part of itself to locate to the hub other than the 4 pins bolted to the rim, in opposition to the way a standard Elan KO interfaces. But if the dimensions of center hole is important to you I can give you some rough measurements and a pix or two, let me know. JB
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PostPost by: Davidb » Sat Feb 04, 2017 5:11 pm

JB: Many thanks for the response and the offer. I would appreciate it if you would measure the inside of the 26R wheel for me and I will compare it to Alan's measurement. I had assumed that the inner part of the hub served some purpose in centering the wheel since it seems to make sense (to me!). But of course, the pegs can do the same job. If you can post photos of the wheel and hub I would appreciate it.

Any comments on my concern about aluminium rear hubs?
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PostPost by: jabingb » Sun Feb 05, 2017 1:02 am

OK, here are pixs of both an S1 and an S2 rim, the S2 part number adds a "-B" and 1/2" more width bringing it to 6". The hub hole and taper interface are virtually the same on both with an id of ~ 2.200" and intersection of the spinner taper face and the back face of the hub hole, or that cylinder of 2.2" is ~ .375". Not sure I can provide much more than that as there is nothing else that would compete for the hub cylindrical protrusion. I have no idea about the various clones that abound, can't help there.

img_6156.jpg and

img_6157.jpg and

img_6158.jpg and
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PostPost by: Davidb » Sun Feb 05, 2017 1:16 am

That is the photo I have been looking for!
I was sure that the hub must support the inside of the wheel centre but as your photo shows-it cannot! Here is the Revolution wheel that I am going to use. The present wheel stud holes are 5/8"-I plan to sleeve them down with 5/8"x1/8th wall tubing (I already have it) so the drive pegs are a snug fit. Now as a result of your photo I know I don't have to worry about sleeving the wheel centre-it doesn't matter. Revolution wheel:
p1060882.jpg and
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PostPost by: Davidb » Sun Feb 05, 2017 1:23 am

Could I make one more request? Could you lay a straight edge across the back of the wheel and measure down to the mounting face. I believe it is called the backspace of the wheel--on the 6" rim.
Many thanks, David
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PostPost by: jabingb » Sun Feb 05, 2017 1:30 am

Both rims have a backspace of 4.500", the 6" rim measuring 6.500" wide and the 5" being 5.500".
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PostPost by: Davidb » Sun Feb 05, 2017 1:59 am

Thank you for that! I used to have a shed full of 26R wheels but sold them with my last racing Elan twenty odd years ago. I could not recall the details of the fitting.
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