A7 Components - Back Axle

We can supply virtually everything you might need to rebuild a back axle. This includes high-quality, British-made crown wheel & pinion sets, halfshafts and rear hubs, branded bearings, gaskets, keys, lockwashers, etc.

Crown wheel & pinions

Our first batch of new spiral bevel crown wheel & pinion sets, suitable for practically any model of Austin Seven, has sold so well that we have sold out of all but the 5.67:1 ratio. However, the next batch is scheduled to be available around the end of May, so please contact us if you are interested in pre-ordering a set. As well as the standard ratios listed below, we can supply non-standard ratios to order.

4.9:1 (⁷/8" dia long pinion shaft, early or late crown-wheel) to fit pre-1929 cars
4.9:1 (1" dia long pinion shaft) to fit 1929 -1930 cars
4.9:1 (1" dia short pinion shaft) to fit 1930 -1931 cars
5.25:1 (short pinion shaft) for post-1931 cars; with or without the 1¹/8" shoulder behind the pinion gear (as fitted from November 1934)
5.67:1 (short pinion shaft) for sports / trials / racing cars

These new crown-wheel & pinions have several advantages over the original ones:

thicker teeth, therefore stronger
improved material and production techniques
greater tolerance to deflection (pinion support is notoriously weak on Austin 7s)
fully machined, therefore better balanced
easier to fit and set up

A full specification, together with fitting notes for the 5.67 (other ratios are similar) can be downloaded here.

Occasionally we also have used crown-wheel and pinions available in good condition.

Halfshafts

New high-quality halfshafts, made from EN36B case-hardening steel, are now available in the following types:

short – 22¹/4" x 0.875" dia, standard taper, 1923-31
long – 23¹/2" x 0.890" dia, standard taper, 1931-38
short – 0.890" dia, extended taper, Special

Hubs

We also supply new hubs to fit standard taper halfshafts, as well as hubs for the extended taper halfshafts. All our hubs are made from EN24T.