Formula D

It looks like the new 2012 rule book has a shift in tire/weights once again. The last update we reported on is in January 2011 where the smallest tire class was 2000-2099lbs allowing you to run up to a 215mm and 2100-2399 was several weight classes ranging from 225mm to 245mm. The heavier cars ranging in the 3000 range have the biggest change in tire sizes. Here is the last weight/tire link to compare old sizes to the new ones. It seems like this is going to be a struggle of regulation focus over the next few years with the series before they can find an ideal weight class ruling. What does everyone think of the new changes to this section of the rules?

9.1.TIRE SIZE REGULATION
9.1.1. Cars are limited to the size of the rear tire that can be used, 
depending on the weight of the vehicle.

9.1.2. A car must be track-ready and running when it is weighed and
 registered to a weight class. A car will be weighed WITH the driver
9.1.3. Once the car is registered to a weight class, it will be
recorded, and issued a class specific sticker that must be displayed
prominently on the windshield. A car's weight may fluctuate within the
limits of its weight class, but it can never weigh less than the minimum
weight for its registered class.
9.1.4. Tire sizes are AS MEASURED in mm, across the span of the contact
patch. Tires will be measured on the rim, while on the car, while the
 car is on the ground.
9.1.5. Tire size must not exceed the maximum size dictated by
class at any time on track.

9.1.6. Tire size will be measured and verified on track before
the start of every tandem round. A FORMULA DRIFT official may
also check tire size at any time during the event.

Weight and Tire Classes-
2100-2399lbs up to 235mm
2400-2699lbs up to 245mm
2700-2799lbs up to 255mm
2800-2899lbs up to 265mm
2900-2999lbs up to 275mm
3000-3099lbs up to 285mm
3100-3199lbs up to 295mm
3200-3299lbs up to 305mm

ORIGINAL POST http://www.wreckedmagazine.com/blog/2012/02/02/2012-formula-drift-rulebook-shows-more-changes-for-weighttire-class/