Competition 2WD drag trucks tire size?

[BillGotthelf]

Took my new and improved 99 to the strip last wed night and was dissapointed in my times until I fiquired out that I had no more rpm's left before I hit the traps. I had 4 consecutive runs topping out at 108. I looked for a lower (3. 08) gear as I have the 3. 55 rear. No luck no one makes anything smaller than 3. 55. DOT slicks seem to top out at 28" for the 16" rim. Hence my 108 top speed. I have watched others try the 15" rims but they have had problems clearing the rear drums. Anybody got any ideas?

 

[MCummings]

Do they have to be DOT rated?



And you can get a ~3. 23 gear for the Dana 80. (Maybe the 70 also?)



www.reiderracing.com Give 'em a call.



Merrick

 

[Fletcher]

http://www.intercotire.com/index.htm They make a 12 x31 for a 16"rim.

 

[BillGotthelf]

The 80 gears will not fit the 70. The tires must be DOT approved in the Street Diesel and Pro Diesel classes in the DHRA.

 

[ob1kobi]

Are you sure its a tire or gearing issue? You should be able to get a lot more MPH out of that gear. I have run 107 with 4. 10's and factory size tires. I know some, like Jetpilot, have run in the 115 range with the 3. 55 gears and factory size tires.



What are your 60ft times like?



Ted

 

[BillGotthelf]

Okay here I go. The factory tires are 31" tall thats 97" rolling diameter. Dot approved 16" slicks at 28" tall=88" rolling. If the truck will do 116 with the tires (31"/97") it will only do 105 with the 28's. I have Pirelli Scorpions (285-65-16) on the truck that I drive everyday on and can easily spin them for 1/8 mile oon the track if I wanted to. I have convinced M&H to send me some prototypes (30. 2/95") they are going to make. I believe I have them convinced to make a 31-33" 14. 5" wide tires for our trucks in a DOT approved sticky tire.