Convert screw on gearing to road gearing.

[biggs682]

cant see theres much differance between road and off road hubs , in terms of strength as long as both are good quality items

 

[vernon]

cant see theres much differance between road and off road hubs , in terms of strength as long as both are good quality items

I think that the bearing seals are more robust on an MTB hub.

There is also the issue of their width. Modern road hubs are 130mm over the lock nuts (OLN) and mountain bike hubs are 135mm OLN.

 

[mattsccm]

Couple of points.
A 7 speed cassette runs on a different freehub to 8 plus. Its narrower. You may be able to use a spacer but life would be easier if you found a hub meant for 7 speeds as original.
Just a point but maybe you could wonder why the axles are breaking. Agreed modern freehub set ups are stronger but the old type was around for many years without being a disaster. The design wasn't all that bad and the unsupported axle issue is much exagerated. I have never even bent a QR axle even when mountain biking in the good old days before freehubs were invented, Equally my CX bike gets a lot of hammer with ancient hubs.
Not to say don't change but maybe see if there is something causing the breakages. Are you doing a lot of jumps or something?It would be a shame if the problem continued.

 

[RecordAceFromNew]

Couple of points.
A 7 speed cassette runs on a different freehub to 8 plus. Its narrower. You may be able to use a spacer but life would be easier if you found a hub meant for 7 speeds as original.

You probably have not noticed, the OP's bike's over-locknut-distance is 135mm... It is not modern road freehub spacing, let alone old 7 speed freehub spacing.