View Full Version : Need some bike data
22 August 05, 19:48
I would need some data on the gearbox rations and final drive of the Honda CBR 1000 RR year 2004.
Basicly I would like to calculate speeds of the bike in each gear at given rpm.
I tried googling a bit, but all the specs are without explicit data about the gears.
As I am not really into bikes I dont know the best sites for the data I am after so I am wondering if you guys can help me. :wave:
Cheers PG :P
P_G - give this a try:
179.8kg (396 lb.)
Weight dist. (f/r):
92/87kg (203.5/192.5 lb.) (helps stop the clocks smashing you in the face :twisted: )
Power 153.5bhp @ 11000rpm
Torque 78.3lbs ft @ 8500 rpm
Primary reduction ratio:
1.604:1 (48/77) (probably between crank & clutch)
Gear ratio I:
Gear ratio II:
Gear ratio III:
Gear ratio IV:
Gear ratio V:
Gear ratio VI:
Final reduction ratio:
2.563:1 (16Tx41T) - Sprocket sizes :P
Tyres (you may need to know the rolling radius :smash: )
120/70ZR-17 tubeless radial
190/50ZR-17 tubeless radial
Top speed is 175mph, but I can't find at what rpm for you. The tyre rolling radius could be quite hard to sort out as bike tyres "grow" quite a lot at high speed - I have seen real wheel huggers with about 10mm clearance at rest, but with holes worn in them from high speed runs.
A tip (as you are a car person! ;) ) performance Hondas typically have a very tall 1st gear and close stacked ratios after that, so if you find 1st gear showing silly speeds it's probably true (I think I read the 2nd goes over 100mph BTW).
23 August 05, 12:48
Cheers Roger-exactly the data I was hoping to find :up: :wave:
Now to find the rear wheel diameter
23 August 05, 13:07
Got it as well-I found a nice Metzeler catalogue with the right data(Maximum tire diameter). Comes close to the calcualted size with the aspect ratio, just a bit biger :wave:
BTW - P_G guess where I found the info?
Honda's website :D :slap: :roflmao:
How hard did you try ;)
23 August 05, 13:45
I tried plenty hard-guess you are much better in finding data than me. On the other hand-I am studying for the exam and I got asked by a friend to calculate him the speed in third gear at 9000rpm (something crash involved-the Father of my friends girlfriend got run over by a CBR1000RR which left him very injured-obviously if the data of the rpm and gear is right that was some speed) and with my lack of time I just opted to ask for the data as I knew that you will be able to find the data far more quicker than I would(kinda counting on you Roger :P ).
BTW: I did look at the Honda website, but was unable to find the ratios. Just some 6 gear cassete gearbox was mentioned.
I was hoping to find the data straight away when I got asked and looked at Honda's site-as for calculating that is a no trouble at all.
Anyway-the calculated data is spot on-slightly under 175mph@11000 in VI gear.
Second gear-165 km/h@ 11000
And the relevant data I was looking for
III gear @ 9000 -> 166 km/h
Big thanks Roger :wave:
3rd gear at 9000rpm is going some - he was obviously in the fat part of the powerband (assuming he was accelerating not braking :P ). As a motorcyclist I can say that, even riding pretty quickly it's not often you need to bother going far beyond 7k/8k ish unless you are in a BIG hurry :OMG: 3rd gear and hitting the power on one of those translates to pretty stupendous acceleration, and not something you do by accident.
I think the problem with gear/revs data might be silly things like - did the bike fall on it's side and knock the throttle open? Did the rear wheel lift when he braked (if he braked), which might let the revs rise beyond roadspeed.
Anyway, I hope your friend gets the result they deserve :wave:
23 August 05, 14:55
Acctually it was a run over accident. The father of my friends girlfriend was on his bicycle driving on the side of the normal road(allowed to do so) and was than run over by the Honda. I belive that he now is in a wheelchair-In any case he is an invalid due to being run over.
I have heard before that going into the high rews on these monsters is not practised much as it is basicly frightening on the open road. I guess that it is on the level of a S4 acceleration on the open roads and that thought to me is a bit scary.
Anyhow-I will be very lazy again-Roger can you please give me a link to the Honda specs directly. I seriously cant find them :o
Cheers PG :P
23 August 05, 15:24
One of the honda bikes claims to be able to go 0-60mph faster then an f-15 fighter jet WOW :twisted:
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