That change alone made a big difference. The D952's outside diameter is smaller than stock, so it has the same effect as lowering the gearing. But that wasn’t enough. Stock gearing is 14/45, but the same bike in off-road form is geared 13/52. Most riders opt for 13/47 or 48, since that allows the use of the stock chain. We wanted optimal tight-trail performance, so we installed 13/50 Renthal sprockets encircled by an RK chain. The shorter 13/50 gearing really isn’t happy on the highway for any length of time, but for hardcore off-road this gearing allows tackling most obstacles in second, leaving first as an emergency save-your-butt gear.