How fast is fast enough for you? ^_____^
- Thread starter bakaneko
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D
Deleted member 12676
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butre, what pipe and what is your RPM at 55mph?
butre
Well-Known Member
the pipe is an aftermarket FMF one for an older cr125. I bought it for nearly scrap value because it had been bashed to hell. it was beyond fixing with just a torch, had to have sections cut out and welded back in
at 55 miles per hour I'm just a hair past 9600
at 55 miles per hour I'm just a hair past 9600
D
Deleted member 12676
Guest
what are your port durations?
bluegoatwoods
Well-Known Member
Well.........I guess I'll go ahead and throw in the opposite point of view.
20 mph is more than enough for a bicycle. I usually average 12 mph over five miles or so. If I'm in a hurry I might average 15.
Going faster than that is simply asking too much from a bicycle. And it's also asking for trouble. Really, anyone who wants to go 40+ ought to be on a real motorcycle.
And I'm aware that there are those who disagree. God Bless and best of luck!
But my advice stands.
20 mph is more than enough for a bicycle. I usually average 12 mph over five miles or so. If I'm in a hurry I might average 15.
Going faster than that is simply asking too much from a bicycle. And it's also asking for trouble. Really, anyone who wants to go 40+ ought to be on a real motorcycle.
And I'm aware that there are those who disagree. God Bless and best of luck!
But my advice stands.
butre
Well-Known Member
I don't know the exact numbers off the top of my head, I'll have to measure it again. I had it all written down but I don't know what I did with that piece of paper. What I can tell you right now is that my exhaust port is widened significantly and raised several millimeters, intake is widened and lowered several millimeters, transfer walls are cut out, and I've got boost ports
butre
Well-Known Member
I can pedal my way to 35. if using it as intended is asking too much then the bicycle industry has some serious explaining to do
bakaneko
Well-Known Member
Take a look at this article from the bicycling.com. 35mph is over the average speed of a Tour de France pro by 3mph on the top end in a time trial.
Apparently, they cruise at 25-28mph, which is at my cruising speed atm. Note, their bikes are obviously extremely high quality and thousands of dollars each compared to mine which is like $20 used.... On my nice hybrid bike, my numbers match very well to the average rider cited in the article. For me, I like to look at the motorized bike in comparison to a 50cc scooter, which has a top speed on flat ground of around 35mph and most people like to keep it a tad under 30mph. That is the point I want to hit on my motorized bike.
http://www.bicycling.com/training/2015-tour-de-france/you-versus-tour-de-france-pro
butre
Well-Known Member
Take a look at this article from the bicycling.com. 35mph is over the average speed of a Tour de France pro by 3mph on the top end in a time trial.
On my nice hybrid bike, my numbers match very well to the average rider cited in the article. For me, I like to look at the motorized bike in comparison to a 50cc scooter, which has a top speed on flat ground of around 35mph and most people like to keep it a tad under 30mph. That is the point I want to hit on my motorized bike.
http://www.bicycling.com/training/2015-tour-de-france/you-versus-tour-de-france-pro
that's cruising speed, not sprinting speed. look at last kilometer, not total average. I know of one tour de france rider who sprints over 40 mph
bakaneko
Well-Known Member
ya, i agree. but, im saying bluegoats has a point too. 15 mph is probably the average speed manufacturers take into account for their durability and life span testing. probably more relevant in braking systems; many with coaster and pad brakes only. of course bikes will support speeds in excess. its funny the tour guys are right at the 66cc speeds
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