Reply With Quoteya..what rain main said.;)
I'm bored as **** at work so I did some quick calculations.I've done over 140 on my 03 9R, did 135 just last week and had some left for sure, not on the red line at all. Oh and my speedo goes up 160.
The final drive ratio for an xb12 is 3.61 to 1, a stock 180/55-17 has an OD of 79.652" (new), and the soft rev limiter kicks in in at 6300RPM.
By those numbers, the absolute max speed of an unmodified xb12 is 131.6 MPH.
Similarly on an xb9. Final ratio is 4.04 to 1. Soft rev limit at 7000 gives you 130.69 MPH.
Bottom line, your spedo is lying to you.
If anyone cares to check my numbers...
(rounding is obviously involved for display purposes)
6300RPM / 3.61 = 1745.152 RPM (rear wheel RPM)
1745.152 REV/Min * 79.652 IN/REV = 139004.88 IN/Min
139004.88 IN/Min / 12 IN/FT = 11583.74 FT/Min
11583.74 FT/Min / 5280 FT/MI = 2.194 MI/Min
2.194 MI/Min * 60 Min/Hr = 131.63 MI/Hr
ya..what rain main said.;)
going by the speedo on my 09xb12 hitting the rev limiter at 7000 rpm 149 mph this could vary because its hard to see at that speed.going by my gps that was with in a couple of 10ths of my time slips at the track 152.65 mph is the top speed it just takes forever to get there.0-130 comes quick the rest takes a couple of minutes
It's funny that some people are too ignorant/naive to believe cold hard facts/math. I thought this "top speed on my Buell" thing was settled a LONG time ago. The math isn't hard folks, and it doesn't lie. It doesn't matter what your speedometer said, or your buddy's GPS: If you have the tire described in buellysses post, then at 6300RPM, you're at 131.6MPH. Even if you're going downhill. At 6800RPM (Kill rev limiter) you're at 131.6*6800/6300=142.04MPH, on a brand new tire.
Want to know the easiest way to go faster (top speed)???
Get a taller tire, even though you'll probably only get a couple MPH.
I really don't mean to be rude, but I've read so many of these ignorant stories that it's very hard not to.
i will go with my gps,and the 3 speed calculators i just used.going by final primary drive,final trans drive,sprocket size,tire size and a red line of 7000/rev limiter they are all about 141-145 mph.a 1/4 mile is to short for top speed but i trust my gps at 142.65
Not everyone here has seen the math so you are being rude, OK so our speedo's are off by a lot, now we know smart ass!I really don't mean to be rude, but I've read so many of these ignorant stories that it's very hard not to.
True but on some bikes a race ECM will bumb your rev limiter so the "with race ECM" may be the part to focus on.
Some tires also "expand"/ deform at high speed making them taller, a hot tire is larger than a cold tire a pilot road 2 is taller than a pilot road soft limit isn't a hard limit
Also in I beleive 08 the xb12 rev limit was bumped a bit
Yadda yadda yadda
Lots of other factors lots of new people that don't know bulls the actual gear ratios or the fuel cut if points
So Let's cut everybody some slack
Edit: everybody beat me to it because I am slow on my phone
One of the reasons I had wanted to trade my 9 for a 12 is because I think my 9 revs too high when I'm cruising on the highway. 65mph is fine, but once I start to hit 75-85mph the hawk exhaust is just roaring. I guess after reading this, even though the rpms would be slightly louder, I probably wouldn't get as much benefit as I thought I would. At least that'll make me like my 9 a little more by comparison.
so we all agree between 135 and 145 what the big deal, not much difference
rev limiters are not accurate either iv had same make,model,engine and trans cars have as much as 400 rpm difference.our bikes are proably the same.then you can always change the rev limit setting.also car and bike manufactures usally set rev limiters between 500 and 1000 rpms below what they consider safe for longevity and warranty concerns i would imagine buell has the done the same.making this all pointless because an extra 1000 rpm or even 500 rpm changes everything. an xb at top speed with anything other than a tail wind can be a very interesting ride on a smooth road the r may be a little better.
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