Wheel stud spacing

[djj_engineer]

What is the pitch circle diameter for a roadster ( Marina)?
I thought they may be A or B series but mine appear to be somewhat smaller.

[h_m_cumming]

Re: Wheel stud spacing

3 3/4" on mine

[meverett]

Re: Wheel stud spacing

Same 3.75” PCD on mine with standard Marina car hubs. Stud diameter is approx 9.5mm.
Van had a wider PCD.

[djj_engineer]

Re: Wheel stud spacing

I measured a hub which I thought was off an A35 or Riley 1.5 at 4 inches which I thought were A series.
But the info you have at 3.75" is the same as mine. So it must be a standard fitting for a Marina axled car.
ie A series.
This explains why the Trials cars in the various shot have steel Rostyle wheels off I presume a Midget/Sprite.

[meverett]

Re: Wheel stud spacing

Yep you have the standard Marina car rear axle and hubs.
The trials cars use the Marina van rear axle which has the larger PCD and a different diff ratio that is more suited to trials.
Cheers, Martin.

[jon_cox]

Re: Wheel stud spacing

The PCD for the standard marina saloon and the lightweight vans was 3.75" or 95.25".
The PCD for the heavyweight van is 5.5" or 114.3mm. This is the same as the MGB GT / Roadster which is the wheels that the trials guys use. They also need the front hubs from the same van so they have matching PCD front and rear. The rear axle is a derivative of the MGB axle hence the different PCD as it was easier / cheaper for morris / BL to drill a different PCD with the front hubs rather than re-engineer the rears.

[stevejgreen]

Re: Wheel stud spacing

The Marina saloon/estate hubs were much more small Triumph derived, from the BL parts bin.

[Harry]

Re: Wheel stud spacing

Hi, mine are 3 3/4 inch and 3/8 UNC studs = 1800 Marina hubs, I've just replaced the studs with 7/16 UNF so I can fit my new alloys.