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post #11 of 28 Old 11-20-2012, 10:15 PM
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standard gearing is a matter of design for predicted use,
a sort of average of what will likely be needed for 'typical' riding..
if your approach to and riding requirements are different to that typical
translation of engine power/torque into the road then it is relevant
and appropriate to change the physics of it by changing ratios..

an engine may produce x power at the crankshaft etc, which will then
be translated into available power into the road via gearing [incl sprocket
ratios].. this is self evident and obvious by the simple test of starting
in first or second or third etc gears.. it is still a matter of ratios..
whatever power the engine is capable of generating will still be
translated thru whatever ratio is selected..

same same should you change final drive ratios..
if you add teeth to the rear wheel sprocket or detract teeth
from the countershaft sprocket, starting in the same gear for both,
then there will be different potential for moving the driven object
[you and the motorcycle], ie, it will be 'easier' for whatever power
the motor is capable of to turn the wheel, thus faster turning..

increased acceleration is inevitable..

there is of course more to it than merely acceleration in first, say,
and such changes in ratio will effect all gears,, for eg, 6th gear
would become 'more useable' generally, becoming closer
to the ratios of 5th gear without ratio changes..

ie, its not only a matter of acceleration for accelerations sake
but can be various subtle changes in the riding characteristics
of the bike, beyond or outside of its 'typical' designed useage..

[as an observation, arbiter, based on observations of contributions
by member motomike, seems you have made a false assumption
as to his motivations and 'illusions' [ ] based on speedo readings]
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post #12 of 28 Old 11-21-2012, 01:02 AM
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The 250 cant pull a 14T properly let alone a 15T.

you'll be struggling to get over 8500 rpm in 6th gear.

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post #13 of 28 Old 11-22-2012, 11:52 PM
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IMHO the stock sprockets gear the bike pretty darn well. I weigh 190-200 lbs depending on how much gear I'm hauling, and for a 250 I don't think lowering the ratio is necessary and it doesn't have the power to raise it w/o losing out in 6th how it would pull. Unless of course, you weigh 125 lbs, you may get away with it. Honda engineers are smarter than many of you give credit.
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post #14 of 28 Old 11-23-2012, 12:08 AM Thread Starter
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Quote:
Originally Posted by kutter View Post
IMHO the stock sprockets gear the bike pretty darn well. I weigh 190-200 lbs depending on how much gear I'm hauling, and for a 250 I don't think lowering the ratio is necessary and it doesn't have the power to raise it w/o losing out in 6th how it would pull. Unless of course, you weigh 125 lbs, you may get away with it. Honda engineers are smarter than many of you give credit.
You have raising and lowering gear ratios backwards. This thread shows that there are different opinions on what gearing is best, so there is no way a Honda engineer can please everyone.


ďThe test of the machine is the satisfaction it gives you." - Robert M. Pirsig
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post #15 of 28 Old 11-23-2012, 09:10 AM
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Originally Posted by Minifur View Post
This thread shows that there are different opinions on what gearing is best, so there is no way a Honda engineer can please everyone.

Ayup.

For example, I don't understand why people are worried about "pulling" 6th gear. You don't run a dragrace in 6th. You've got five other perfectly acceptable gears for when you're not just cruising along.

Not to mention it pulls just fine above 60.
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post #16 of 28 Old 11-23-2012, 12:18 PM
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Quote:
Originally Posted by Minifur View Post
... This thread shows that there are different opinions on what gearing is best, so there is no way a Honda engineer can please everyone.
Agreed, Honda builds motorcycle for the masses, and as such things like final drive gear ratios will generally come down to compromise. Optimal performance more often than not, has to take a back seat to factors such as governmental noise and exhaust emission standards, or even a desired fuel economy target for the purpose of product marketing.

I do know for a fact that where I operate my bike, at high altitude on mountain roads, the change to a 13T front sprocket has improved the ridability of my bike.
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post #17 of 28 Old 11-30-2012, 08:22 PM
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yes, you will lose some acceleration in 6th when you go to 15T. But don't forget you have a 5th gear, which is perfect for highway passing.

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post #18 of 28 Old 12-01-2012, 11:31 PM
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I've made a couple of front sprocket gear changes on my V-Strom 650 and they do in fact make a difference. There is always a trade-off either in top end or on take-off and you can improve one but only at the expense of the other. Ultimately I went up a tooth on the sprocket so I could improve interstate cruising and it reduced my RPM's by 300 and made cruising a little nicer on the interstate when I traveled from Tennessee out to Montana this past summer. When i ran the Dragon at Deal's Gap, it definitely hurt the bikes ability to power out of the corners. Not that it was drastic, but noticeable for sure. I think the CBR 250 strikes a nice balance overall. If I lived next to the dragon or a similar style road and that was the type of road I was going to ride most of the time, I'd definitely go with a 13t. If I planned on commuting on the expressway and wanted the bike to be a little more relaxed at 70 MPH, then going up to a 15t would be the way to go. As it is though, this bike is a commuter as well as a fun weekend curve hugger so I am leaving it stock to strike a balance. On the switchbacks that I have had the CBR on as well as tighter sweepers, I think the CBR can hold it's own pretty well due to its crisp handling. While not a 600cc sportbike, if ridden by a reasonably experienced rider, no Harley, Goldwing or standard cruiser is going to be able to hang with it in the twisties. In fact, I believe the CBR as it sits it stock form would eat my V-Strom 650 for lunch on the tighter curves of roads like the Dragon.
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post #19 of 28 Old 12-02-2012, 10:04 AM
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Well said ronjr009. I kind of chuckle about all the arguing over a personal preference thing, like how much salt is best on a potatoe?
That being said, I'm still tossing around going to a 15t as I'm one who fits into the "a little more relaxed at 70mph" category.
I still am not sure about the availability though, months and months ago I called/emailed PMP sprockets and they were back ordered again and they never followed up on my email. I'd have probably gotten one if there was an online site (in the states) I could easily order one from ....
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post #20 of 28 Old 12-03-2012, 10:43 PM
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Originally Posted by Desert Dweller View Post
That being said, I'm still tossing around going to a 15t

I bought a spare when I originally bought mine. I'd be willing to sell it to you for a wildly inflated price.
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