Grand Prix 250
Main Motorcycle: 08 R1200GSA Adventure
Join Date: Oct 2009
Location: McComb MS
Other Motorcycle: 09 Triumph Speed Triple
Extra Motorcycle: ZX12R ( I wish )
|Speed Triple Forum Rants and ravings about the best naked triple on the planet!|
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without examining the math, I'm having a hard time believing these vehicles with power/weight ratios better than that of some supercars, can't exceed 140. I see posts of people hitting 130 in their stock civics, surely a bike is going to produce less drag than any car? Isn't 140 typically the figure that speed governors are set at?
It's called gearing and wind resistance. Theoretically, the '09-'10 Speedy should do about 168 @ 10,000rpm. However, peak hp is at 9400, I believe. This would mean you'd be hard pressed to hit 10,000rpm in 6th unless modifying the bike to reduce wind resistance. At 9,400rpm you would be going about 158mph, again theoretically, wind resistance may keep you from even getting to that speed.
12340987, you might be surprised at the Cd of a naked bike vs a car. The car has more frontal area to be sure, but the Cd is usually so bad on a bike like that this that it makes up for it.
For reference, a typical sedan these days probably comes in around .30 Cd or lower. Examples:
Mazda 6, Honda Civic hybrid, Lexus GS - .27 Cd,
Toyota Camry, Nissan 350Z, Mercedes SL - .29 Cd
Honda Odyssey, Honda NSX - .30 Cd
As you can see, physical size has less to do with drag than you might expect.
I didn't find an Cd numbers for bikes, but I understand they run closer to 1.0 - or 3+times as much drag as a modern car. Open, exposed wheels and no fairings are just bad at parting the air.
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|2001 Speed Triple or 2003 speed four????||TheBigCat||Speed Triple Forum||8||04-26-2010 05:31 AM|