Hi , are your front and rear roller coupled or independent of each other? How do you plan to lockup the roller to get vehicle of the chassis dyno?

There is no optimal distance since each size wheel would be different.

Posted by: PPSA

Hi there

Does anyone perhaps know what the optimal distance should be between the two rollers (front and rear) without making it impossible to drive the vehicle out the dyno?
I would like to get rid of the air jack that lowers the car into the dyno.
The rollers are 270mm in diameter.

OK , just measured my Dyno Dynamics 650Max chasiss dyno ( NOTE NOT THE DD450KW bed  unit ) , which has 275MM diameter front and rear rollers and the distance is 200MM  edge to edge of the roller to roller. 

Just factor in that the front and rear rollers are independent of each other on my DD650max and the rear rollers are just idler rollers.

I have no issues strapping down big horsepower vehicles regardless of tyre size and they all climb out of the rollers and just run on the front roller only. 

I have seen some chassis dynos that have the front and rear rollers are coupled together and vehicle runs on both. What is the distance between rollers on  these type of chassis dynos ? I have no idea???