Triumph Sports Cars

engine swaps and other performance upgrades, plus "factory" V8s (Stag and TR8)

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Richard/SIA
Richard Brengman
No. Nevada
(351 posts)

Registered:
01/17/2014 07:47PM

Main British Car:
1969 Triumph GT6+ 225" Buick V6

Convert my front hubs from 4x114.3 (4x4.5") to 4x108?
Posted by: Richard/SIA
Date: October 03, 2016 10:28PM

Bet this has never been asked before!

Need to convert my front hubs from 4x114.3 (4x4.5") to 4x108.
"Large" Triumph to Alfa Romeo Spider.

The brake rotors on each car are nearly identical for diameter and thickness.
Car will be too light to worry about swapping to vented rotors as they do need to reach operating temp.
May slot or drill them.

I see a couple of ways to do this.
Plug and re-drill the TR hubs, 3.15mm off-set per hole.
Would be happier with this if I could get virgin metal but the way TR hubs are cut that is not possible.
Might be able to use a different wheel stud with a larger shank for less eclipse of the hole?

Make new TR hubs with the correct PCD in steel or Aluminum.
Possible but a lot of work.

Make custom TR to Alfa front stub axles to take the Alfa hubs.
This may actually be the simplest answer, have to figure out what steel to use and possible heat-treat?
Could probably alter the profile to make them stronger at the same time.
Some claim an issue with stock causing brake pads to back-off in hard use.

Cool to have CNC tools handy, not so cool to have to make custom Geometry/G-Code for only a pair of parts.

Which solution is the consensus for "Best"?

Something I have not thought of?
I deliberately left out adapters as asking for trouble.


88v8
Ivor Duarte
Gloucestershire UK
(769 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Convert my front hubs from 4x114.3 (4x4.5") to 4x108?
Posted by: 88v8
Date: October 08, 2016 02:13PM

Revington have ally hubs.
If you ask them nicely, perhaps they'll sell you a hub undrilled, ie no stud holes.
[www.revingtontr.com]

A lot less bovver than redrilling.

Ivor.


Richard/SIA
Richard Brengman
No. Nevada
(351 posts)

Registered:
01/17/2014 07:47PM

Main British Car:
1969 Triumph GT6+ 225" Buick V6

Re: Convert my front hubs from 4x114.3 (4x4.5") to 4x108?
Posted by: Richard/SIA
Date: October 11, 2016 12:34AM

# 114284AL
I've emailed them but expect the answer to be No!

Most companies do not want to edit their CNC program.


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