TIBUS Bolt-on portals
Extraordinary clearance for extraordinary adventures
Portal axles create unique ground clearance by virtue of the axle tube and the differential housing being situated above the wheel center. This technology is the only way to properly achieve proper ground clearance that doesn’t just affect the car’s body.
TIBUS Bolt-on portals will give your vehicle a "lift" of about four to five inches (100 to 125 mm). Naturally, by using larger wheels you’ll be able to augment your ground clearance even further.
Body Lifting of e. g. a Suzuki Jimny
Body Lifting with TIBUS Bolt-on portals
TIBUS Bolt-on portals are attached to the existing axles and create a lift of 115 mm. The larger tires of the dimension 225 / 75R16 - standard is 195/80R15 - an additional 25 mm.
This results in a ground clearance of 350 mm beneath the differential.
That's an improvement of 70 percent.
In order to achieve this ground clearance without portals wheels with 40 "or tires of a diameter of 100 cm must be installed. This is not feasible!
The built-in reduction of the TIBUS Bolt-on portals compensates additional size of the larger tire, so that no additional load is generated on the drive train. The supplied drive shafts for the Suzuki Jimny made of the material '300m' add even more stability to the axles.
The axle geometry is not affected at all so that no disadvantages occur during driving. The turning radius gets smaller, which is another advantage.
All electronic systems work as usual. A vehicle with TIBUS Bolt-on portals can be used without restrictions in everyday use.
Body lifting by suspensions-kits
A body lift with springs and/or bodylift creates optical advantages compared to the the standard state but disadvantages on the road and no significant benefits in the field.
The front axle of the Suzuki Jimny is guided on radius arms. Thus, when using longer springs, the axle geometry also changes (caster) so that the straight-line running of the vehicle deteriorates, which leads to extremely restless driving behavior in a vehicle with such a short wheelbase.
The Suzuki Jimny is fitted as standard with 195 / 80R15 tires. The diameter of the tires is 69,3cm or 27,5 "
Thus, the Suzuki has a ground clearance under the differential of 21 cm.
Using a tire size of 225 / 75R16 with a diameter of 74.4 cm or 29.5 "increases this ground clearance and 2.5 cm. The total ground clearance is now 23.5 cm.
Because of the larger wheels the load on the entire drive train is increased so defects are more likely in these components. The larger wheels also increase the turning radius of the vehicle. Due to the loss of power, the maximum speed is also reduced if the ratio in the differential is not changed accordingly.
Although portal axles are more expensive, they offer considerable advantages on and off the road. There is no alternative.
TIBUS Bolt-on portals are available for Land Rover, Mercedes Benz G-wagon, Nissan Patrol and UAZ as well as for some Jeep and various Toyota models, also for Suzuki Jimny. Portals for other vehicles will follow soon.
We are currently working on adapting TIBUS Bolt-on portals to various independent suspensions on the front axle. You can find out more about the state of development on our "News page" and at Facebook or you can register for our newsletter.
The bolt-on solution developed by TIBUS Offroad Engineering is an unrivaled way of maintaining the modified car to use as your daily driver.
You can get a lift of up to 8” keeping the stock suspension, maintain use of the OEM electronic damping, ABS, traction control and other electronics (if equipped) without any error codes or warning lights activating.
In order to drive larger wheels no further modifications have to be made to the suspension. The entire axle and steering geometry is also maintained.
For optimum equipment we recommend TIBUS bead-lock wheels which have been specially developed for the use with TIBUS Bolt-on portals but can also be mounted on Mercedes vehicles without portal axles.
TIBUS Bolt-on portals are installed on the existing axles, with their special design maintaining their rotating direction. The portal reduction guides the power to the wheels, while the portal gear ratio reduces the load on the complete drive train since the torque acts only on the wheel.
The gear ratio of the TIBUS Bolt-on portals is between 1.16 - 1 to 1.6 - 1 depending on the type of vehicle and it’s intended use. The overall axle ratio changes corresponding to the respective factor, which makes it possible to drive large wheels without having to adjust the gear ratio of the differentials.
To monitor the oil temperature in our bolt-on portals we recommend the TIBUS temperature monitor "TMS18".
The TIBUS Bolt-on portals are each designed to fit the standard GVW of the vehicle accordingly. If a higher payload is desired, please contact us so that we can find an optimal solution.