Gearing. What have you tested? - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 78 Old 05-03-2012, 03:30 PM Thread Starter
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Gearing. What have you tested?

I am thinking of doing a +2 rear sprocket

right now at 75MPH in 6th I am at about 8,000RPM. I want a little more go around 70-75 MPH.
For those of you changing gearing
What are you seeing RPM/feeling wise on it?
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post #2 of 78 Old 05-03-2012, 03:35 PM
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peak horse power on the bike is at 8500. Dont think it will give you what your looking for.

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post #3 of 78 Old 05-03-2012, 04:27 PM Thread Starter
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peak horse power on the bike is at 8500. Dont think it will give you what your looking for.

I Guess I will have to stay off the freeway then.
Holding it wide open to stay at 75 to stay with traffic sounds retarded to me.

I miss my big bikes lol
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post #4 of 78 Old 05-03-2012, 05:26 PM
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What in the world are you hauling to have to be WOT for 75MPH?
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post #5 of 78 Old 05-03-2012, 09:54 PM Thread Starter
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What in the world are you hauling to have to be WOT for 75MPH?

my 195 lb ass.

traffic flys at 75-80 MPH. If i stay under it's almost death.. Well on the freeways here. So I try to stay at 75 in the Carpool lane but most the time I find it wide open to keep it at 75
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post #6 of 78 Old 05-03-2012, 10:56 PM
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Im 170. WOT for me is 94.
You would go down in back up in front for more top speed lower rPms

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post #7 of 78 Old 05-04-2012, 03:39 AM Thread Starter
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Im 170. WOT for me is 94.
You would go down in back up in front for more top speed lower rPms

the fastest I have had this is 81.. that's it.

why would I want to go Up(front) Down (rear) if the bike can't even hit full redline in 6th stock?

my GSXR600 woudl not hit redline in 6th on a track in AZ. I did -1/+2 and was able to hit redline in 6th without a problem and the bike pulled the whole time..

so what would +(x)/-(x) gearing help if the bike doesn't have the power/gear reduction to pull it's own weight?

I just noticed. Your sig. shows you having a few things done to your 250. Mine is 100% bone stock.
My wifes has a two bro's slip-on and I can tell her's is faster. it also will do 85 with me on it without a problem
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post #8 of 78 Old 05-04-2012, 12:34 PM
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.....fastest ive gotta mine to was 89-90..... downhill with barely any wind, best tuck i could manage.

but im almost full throttle at 75......with wind.

6'1" 240lb rider.....bike is sluggish at anything more then 70. traffic in my area moves fast....75-80mph.
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post #9 of 78 Old 05-05-2012, 07:19 AM
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I Guess I will have to stay off the freeway then.
Holding it wide open to stay at 75 to stay with traffic sounds retarded to me.

I miss my big bikes lol
I AGREE this bike is a dog on the freeway ecpecially with the wind in your face.
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post #10 of 78 Old 05-05-2012, 12:05 PM
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I changed the sprockets on my Ninja250R and it made for a much taller and more usable 1st gear, but I don't think the CBR needs it. The stock gearing is the best I've seen on any 250. I'm taking a "if it works, don't mess with it" approach to my CBR compared to going crazy with mods like I did with the Ninja. The CBR is as close to perfect as I've seen in a 250cc street bike in many respects. It doesn't cry out for mods as urgently as my Ninja did.
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