My blonde moment of the day!

[yamaha225dr]

So I bought my 250r thinking the rear sprocket was swapped for a 45tooth one. I haven't been able to stretch its legs much in six gear but thought it was geared fairly well to have such a drastic reduction in gear ratio over stock but never did actually count the teeth. I decided to stop by a local store today and pick up a factory sprocket to get things back to stock and what do I discover when I get home and take the old one off? The sprocket on there was stock! :facepalm: Why not take it back you say? Well, I was installing it when the discovery was made! It is a 38tooth versus the stock 39t but what is that gonna do? Change my gearing 1% over stock? :lol: I guess on the bright side I can consider it preventative maintenance and I now have a perfectly good spare! I could have spent that $28 on something else more important though.

[tri again]

awww, shucks.
Ya GOTTA allow yourself some of those things.

Just to make you laugh, if it was 100 teeth and one tooth different it would be 1%, so you can brag about the custom gearing at 1/2% and start a new trend in the racing circuits, sell a million and be rich.

Maybe make a nice clock? and a great spare that you'll never lose.

Two blondes walk into a bar, the brunette ducked.

[yamaha225dr]

So I might gain .001mph on the top end and just for future reference I am not blonde!:lol:

[nstyle73]

That's not really how gear ratios work ....... Your percent difference will be the difference in the ratio of the the sprocket set. Say a 13/39 versus a 13/38. ( I don't know what tooth count your front sprocket is so I used 13 as an example). So the 13/39 is a 3:1 ratio where the 13/38 is 2.92:1 ratio. Its not a huge difference but, depending on how you want to express it, going from a 39 to a 38 raises your gear ratio about 2.5% (2.5% lower numerically)

[yamaha225dr]

Thanks for the mathematical equation. I was just joking at my own expense and my countershaft sprocket is a 13 tooth!

[nstyle73]

Sorry, no disrespect meant by it.

[MyMistress86R]

So I bought my 250r thinking the rear sprocket was swapped for a 45tooth one. I haven't been able to stretch its legs much in six gear but thought it was geared fairly well to have such a drastic reduction in gear ratio over stock but never did actually count the teeth. I decided to stop by a local store today and pick up a factory sprocket to get things back to stock and what do I discover when I get home and take the old one off? The sprocket on there was stock! :facepalm: Why not take it back you say? Well, I was installing it when the discovery was made! It is a 38tooth versus the stock 39t but what is that gonna do? Change my gearing 1% over stock? :lol: I guess on the bright side I can consider it preventative maintenance and I now have a perfectly good spare! I could have spent that $28 on something else more important though.

Wait...this is making my head hurt.

First...you posted to admit that you had absolutely no clue what rear sprocket your R had (45t should appear about the same circ as the SUN!) without taking the 13 seconds needed to know for sure and then...

2nd...tell us you stopped by a shop and bought a "factory" sprocket to install...AND THEN...

3rd...exclaim in surprise that the existing sprocket was "stock" at 38t and your "factory" replacement was 39t...

Really?:wondering Head pain explained...:rolleyes:

[yamaha225dr]

:lol: The original sprocket had the number 45 stamped in the side and that's what I assumed the teeth count was. I went to the motorsports store with the intention of getting a stock 39tooth one but all that was available in stock were ones with 38teeth. I figured it was close enough and just got that instead.

[yamaha225dr]

Sorry, no disrespect meant by it.

Sorry man, I was in a hurry when typing that. I didn't feel disrespected by your post at all!