Here’s a good idea for all of you hard core off roaders- BoltOn Portal Axles.
So let’s start from the beginning, what are portal axles?
Portal axles (or portal gear) are an offroad technology where the axle tube is above the center of the wheel hub and where there is a reduction gearbox in the hub.
Ground clearance is increased and the hub gearing allows the axle halfshafts to drive the same power but at reduced torque (by using higher shaft speed). This reduces load on the axle crownwheel and differential.
Bolt On Portal Axles by Tibus off road engineering are portals which can be attached to existing axles.
Portals are developed to maintain the rotational direction of the original axle which is achieved by using 4 gears inside the drop box.
Another advantage of 4 gears is the optimal distribution of torque on more gears.
Due to this fact a higher torque can be transmitted inside the drop box and temperature development is improved.
By installing Tibus axles, vehicle height is increased 5″ (125mm) or 4″ (100mm).
This height increase allows you to mount larger tyres without changing your suspension or even cutting your body work.
Axle and steering geometry stays untouched.
To achieve this gain of ground clearance without portals you would have to mount 10″ bigger tyres.
This would mean more than cutting into your car´s body panels as most axles wouldn´t have the strength to handle these tyre sizes off road.
Axles are currently available in two versions.
1,6:1 for heavy offroad use
1,16:1 for daily use, travel and expedition
For the Land Rover Defender, Mercedes G and Jeep axles.
Portal drop boxes can be fitted to independent suspension vehicles too.
Now, you could say “i don’t need it” but Unimog axles are heavy as hell. There’s another solution, Volvo C303 portals, but the price for these is skyrocketing day by day.
Think about it!
TEXT: Emilio Mocibob
PHOTO: Tibus Off Road Engineering