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Originally Posted by Oengus
I thought that the first gear and final stage were always the same, is that not correct?
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First Gear and Final Drive Ratio are separate items.
Final Drive Ratio consists of the front and rear sprockets only. SportRider has a helpful article:
http://www.sportrider.com/tech/146_0...ing/index.html
Based on the pictures in your 'SUV' thread, looks like you are following ChinaV's XTR thread on MyChinaMoto. Did you notice the gearing changes he has made? I think his riding & reporting can answer a lot of your questions about the gearing differences between the XTR & SUV.
I'll try condense ChinaV's report:
stock XTR - 3.154 Final Drive (13/42 tooth sprockets) - "Pass 75kph [46 mph] and things get painful." [Based on his off-road pics, I think he is also doing some technical off-road riding too.] "The trails around my house are very rocky, the bike (and rider) really get pounded and the XTR seems to be handling it well."
ChinaV said he has changed 3 different XTR250s Final Drive Ratio to help them on the street and has used 2 similiar combinations. 2.824 (17/48 ) or 2.882 (17/49). Note: He also converted to 428 size chain, so a 17 tooth front sprocket could fit on the countershaft.
The results- "90-100kph [55-62mph] is smooth as silk, and the bike
still has plenty of power to pull at lower speeds. Top speed via GPS is 120kph [74mph]."
So, it looks like changing the XTR gearing (3.154) over to an SUV ratio (2.882) doesn't hurt your off-roading, but gives you a higher cruising speed.