Who still races the CBR250R? - Page 4 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #31 of 36 Old 06-10-2017, 04:22 PM
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Originally Posted by kfox View Post
Yep, that where I got the conversion. Just double checking to see if that looks right to others.
i cant believe i have never used this website!
i dont race, but i do enjoy what i consider spirited rides on the backroads around here.
kfox, i'm about 3 hours away from you. i actually just vacationed in san marcos a few days ago!

i'm thinking about changing my sprockets and chain. if i can get a 15/41 setup, i think i'll be happy. i am somewhat silly though. this is my 13th bike in 10 years of riding, and i dont know anything about chains... i know there's 520 and whatnot, but i dont know what those numbers mean, and i dont want to order the wrong parts.
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post #32 of 36 Old 06-10-2017, 07:26 PM
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Originally Posted by Matt Danger Lynch View Post
i cant believe i have never used this website!
i dont race, but i do enjoy what i consider spirited rides on the backroads around here.
kfox, i'm about 3 hours away from you. i actually just vacationed in san marcos a few days ago!

i'm thinking about changing my sprockets and chain. if i can get a 15/41 setup, i think i'll be happy. i am somewhat silly though. this is my 13th bike in 10 years of riding, and i dont know anything about chains... i know there's 520 and whatnot, but i dont know what those numbers mean, and i dont want to order the wrong parts.
The numbers used to classify different chain sizes all refer to eighths of an inch..

The '5' in 520 means that the distance between two roller pins is 5 eighths of an inch. (5/8)

The '20' refers to the width of a chain measured between the inside of the side plates (sprocket width).
20 means that the inside width is 2 eighths (1/4) of an inch.

ie. My old GSXR400 race bike used to run a 525 chain so the pitch was the same as my CBR chain but the inside width was 2 and a half eights of an inch (5/16) wide, so it had thicker sprockets.

Clear as mud?
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2013 CBR250R repsol (sold)
2014 CBR300R (sold)
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post #33 of 36 Old 06-10-2017, 08:16 PM
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almost sounds as fun as math! hahaha
... so if i wanted a 15/41 (or 40) setup how many links would my chain need... is there a simple way to figure that one out?
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post #34 of 36 Old 06-10-2017, 09:52 PM
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Originally Posted by Matt Danger Lynch View Post
almost sounds as fun as math! hahaha
... so if i wanted a 15/41 (or 40) setup how many links would my chain need... is there a simple way to figure that one out?
A standard CBR250 chain is 108 links so in theory you if you are going to a 40 tooth rear which is two teeth more than standard then you would require a 110 link chain.

I wouldnt worry about it too much, just buy a longer chain and chop it to suit, that's what most folk do.
Most off the shelf chains (boxed) come in a length of 120 links.
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2007 SV650 (track bike)
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post #35 of 36 Old 06-12-2017, 10:45 PM
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thanks for the reply... i think i might actually spend some money on some chain tools... i have been playing with bikes for around a decade, but still dont have all the tools i need!
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post #36 of 36 Old 06-13-2017, 07:12 AM
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Originally Posted by Matt Danger Lynch View Post
thanks for the reply... i think i might actually spend some money on some chain tools... i have been playing with bikes for around a decade, but still dont have all the tools i need!
Good idea, I have this DRC Pro chain tool which works really well. Breaks, presses and rivets. It's made in Japan so good quality. Recommend it.

- DRC PRODUCTS -
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2013 CBR250R repsol (sold)
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