I was wondering if any body knows how much top end speed I would gain on my 2007 big bear 400 if I went form 25'' tires to 27'' tires. Also since the big bear is so low geared, that by going with the larger tires does any body have problems with not having enough low end power. Iam looking at putting on kenda mud tires with 1 1/4 tread depth compared to my factory mud lites with 3/4'' tread depth.

 

if you put bigger tires on your gona loose top speed if anything

 

Theoretically, you should gain top speed with larger tires since they roll further with each revolution, but if you don't have enough power, you won't be able to pull the same RPMs as with the lighter 25" tires, thus losing top speed. My '02 had no problems turning 27" Mud Bugs & 26" Mudlites, but don't do it for the speed, do it for the clearance and traction. I loved my Big Bear...bulletproof...but not geared for speed!

 

change the clutch and the clutch basket. that will run you anywhere from 250 to 500 bucks depending on what you have done and what you replace.

 

is there anything that will bring up the top speed on a big bear? i know there not ment for speed, 45-50mph is rly tops

 

im running 27 ITP 589s on my big bear and it increased the top end slight (only about 3-4 mph)

 

Keep stock, trade on 550 or 700.

 

yea if you want more speed Id go with wat hefty lefty is saying, the big bear is more of a pullin or low gear mudding machine