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Old 10-12-2011, 10:42 AM   #94
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Join Date: Sep 2011
Location: New York
Posts: 9,474
My Ride: '04 330Ci
Underdrive pulleys are larger than stock

So a longer belt is used in order to not move the tensioner pulley to a different position.
My underdrive pulley kit included two pulleys along with a new drive belt.
Where are you buying yours from?

Originally Posted by moiz21 View Post
When changing to underdrive pulleys you have to use a different type of belt? Thought it would be the same one.
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