Width of track

[canuck]

Chaps,
I will be installing a complete rear MGB banjo axle to my one-point-five. The axle is narrower than the Riley one so some work is needed, all possible. I will relocate the spring perches etc. well within my abilities.

I like the appearance of the early MGB steel wheels, (below an example not my car) and they accept the Riley hub cap so I will be using these. I am not sure of the offset of these wheels as I have not yet measured.




To use/fit these wheels  I will require spacer/adapters to accommodate the PCD difference of the Riley to MGB wheel and width.

The WSM tells us the track for Front width @ 50-7/8" and Rear width @50-5/16" .
Due to the narrower MGB axle the spacer for the rear will need to different than the front.  

My question is; where is the track width measured? Centre of wheel to centre of wheel? 

Add anything I have missed or tell me I am crazy. 

Thanks in advance.

Bruce

[2robert4]

Hi Bruce
Measuring the rear track is no different to the front your track gauges touch on the wheel rim on both wheels this gives the dimension you require you can check on the leading edge then the trailing edge to find the deviation from parallel. Hope this is of some help?

NP

[canuck]

Thanks Nigel, however you can't see the puzzled look on face from where you are.  

I don't wish to come across as being thick, but I am not sure what Track gauges are, and which part of the rim are talking about? 

I suspect the offset of the wheel rims I plan to use will be different than the OE rims. I will need spacers/adapters to handle the PCD difference to the hubs so some variables for me to work on.  The Riley PCD is 4x4 while the MGB is 4x4.5.   

Unfortunately I am not near my car to do a quickie check against the factory specifications we have.  FWIW the MGB track is stated as 49-1/4"  so I know I will use a thicker spacer at rear than front. 

Back to you


Bruce  

[2robert4]

Bruce
I was not thinking, you can make a gauge very easily using a piece of string or a tape measure, the axle needs to be fitted to the vehicle and the wheel rims without tyres are fitted on either end of the axle. You need a helper to hold one end of the string at the outer edge of the rim on their side and you pull the string taut at the outer edge of the rim on your side this measurement is the track and as there and as there is nothing pulling the wheel one way or the other like a track rod either side of the rim should have the same reading. You can then work out which spacer to use to give the Track or "Width between the wheels" required.

NP

[canuck]

Thanks again Nigel,
I will be at my cars early next week so I will do a couple of quick measurements to interpret this track measurement provided by the factory.

In the immortal words of Arnold Schwarzenegger "I'll be back".  

Bruce

[iowdel]

Hi, I am in the process of having adaptors/spacers made 4"pcd-4/12"pcd i could get you a set made if interested?

[canuck]

Mar 31, 2022 15:33:51 GMT iowdel said:

Hi, I am in the process of having adaptors/spacers made 4"pcd-4/12"pcd i could get you a set made if interested?

Hello I appreciate the offer.

I had designed 'spacers' for my project only to have the idea shelved as I elected to install disc conversion up front that will allow me to re-drill the hub for the 4.5" PCD studs.

The rear will be taken care of by a MGB rear axle that is already 4.5" PCD. 

My thinking was not intended to alter the track by more than 1.5".  A 3/4" spacer, 4.0" PCD holes screwed through the drum with a 0.375" countersunk screw threaded into the hub. I would remove the OE studs from the hub, drill, tap and install threaded inserts to secure the spacers.  The spacer will have studs pressed in @ 4.5" PCD to accept the road wheels. 

Keep well

B