Chain length - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 18 Old 12-12-2015, 05:52 AM Thread Starter
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Chain length

Really a question for shisoshin as he has had both 250 + 300.

If the 250 chain kit is 14/38 and 108 links the 300's 14/36 is also listed as 108 links, is this correct or is it 106 links as you would not have the adjustment range for the chain otherwise?

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post #2 of 18 Old 12-12-2015, 08:46 PM
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hi lemmy - well mate, i never swapped chains on my 250/300
but at first glance i reckon if someone like the sprocket center
list kits with chain length of 108 you can be reasonably
sure that they will fit..

changing sprockets has been a fairly hot topic here
and other forums so no doubt someone will
have direct experience and valuable advice..

bear in mind tho that you can get chains
at any length or pitch you choose
together with sprockets of different
sizes and metals/weights etc..
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post #3 of 18 Old 12-12-2015, 09:27 PM
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I tend to order big and modify to fit. Often the 120 link chain is cheaper than the "right sized" chain. With a hand drill disk grinder you can remove rivet ends and fit the chain to whatever sprocket set you are using.

I took the rear sprocket on my CRF230L from 39 to 48 teeth that way.
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post #4 of 18 Old 12-12-2015, 10:24 PM
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Quote:
Originally Posted by lemmy99 View Post
Really a question for shisoshin as he has had both 250 + 300.

If the 250 chain kit is 14/38 and 108 links the 300's 14/36 is also listed as 108 links, is this correct or is it 106 links as you would not have the adjustment range for the chain otherwise?
The 2 tooth difference between the 38T and 36T sprockets doesn't amount to much of a difference in the diameter of those sprockets, so therefore the 108 link chain length works for both applications.

Incidentally, when you order a replacement chain from Honda, it is supplied in a 120 link length. They do this because it will fit various models simply by cutting it to the proper length.
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post #5 of 18 Old 12-13-2015, 10:13 AM Thread Starter
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Well I'm not disagreeing with either of you, in my mind if you reduce the rear sprocket by two teeth, thats equivalent of a link in the top and bottom run of the chain, at 16mm roller pitch thats 16mm of adjustment to take up excluding the reduction in diameter of the sprocket itself.

Begs the question, would it not be better to reduce the chain length to 106 teeth? rather than possibly running out of adjustment, and does it make a mockery of the markers that says you chain needs replacing as you got there 16mm earlier on a cbr300!!

5/8" pitch is converted to 15.87mm

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post #6 of 18 Old 12-13-2015, 05:47 PM
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even tho one or two teeth may be added or removed
either end, this wont make a huge difference to
the distance between countershaft and rear sprocket
centers where the movement happens, and thus
where adjustment happens..

for starters you have a top and bottom run
along the same line [of adjustment]
so whatever the equation one extra or lesser
tooth would influence that distance by
half a tooth[?] ditto two teeth/links
woiuld be halved [roughly] to one
in terms of distance center to center
[i would think]..

whatever number of teeth must be absorbed
around both sprockets [and half of the run]..
so sprocket diameter if different [?]
would also be a factor..
[think toothless sprockets]

that would seem to indicate that [as mm noted]
it wouldnt make that much of a difference..

but its still up to you as to whatever chain length
you choose/prefer.. as mentioned chains come
in different or infinite lengths to be cut
to your choice..

[my maths is but rudimentary, but the principle
seems about right, as to chain runs etc]
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post #7 of 18 Old 12-14-2015, 12:08 AM
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Quote:
Originally Posted by lemmy99 View Post
Well I'm not disagreeing with either of you, in my mind if you reduce the rear sprocket by two teeth, thats equivalent of a link in the top and bottom run of the chain, at 16mm roller pitch thats 16mm of adjustment to take up excluding the reduction in diameter of the sprocket itself.

Begs the question, would it not be better to reduce the chain length to 106 teeth? rather than possibly running out of adjustment, and does it make a mockery of the markers that says you chain needs replacing as you got there 16mm earlier on a cbr300!!

5/8" pitch is converted to 15.87mm
As a general rule of thumb, you can figure that a given chain length (which is always an even number) will cover 3 rear sprocket sizes, assuming the countershaft sprocket is the same...

33,34,35 - 106 link

36,37,38 - 108 link

39,40,41 - 110 link

42,43,44 - 112 link
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post #8 of 18 Old 12-15-2015, 04:16 AM
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Quote:
Originally Posted by lemmy99 View Post
Really a question for shisoshin as he has had both 250 + 300.

If the 250 chain kit is 14/38 and 108 links the 300's 14/36 is also listed as 108 links, is this correct or is it 106 links as you would not have the adjustment range for the chain otherwise?
Hey Lemmy, I ride a 300R and can tell you it has a 108 link chain standard. Ive dropped one tooth on my sprockets from standard and at 8K miles on the clock I'm nearly out of adjustment.

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post #9 of 18 Old 12-15-2015, 07:34 AM
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Then measure the chain link to link. If it is still in spec, cut out a link or two and keep going!

*I'm not singling anyone out here, and me No disrespect in the following......

This thread is reminicient of a "best oil" thread. Chain length is not, nor needs rocket science type debate. "Use what works best for you" definitely applies here.
If I changed sprockets, and if I were sure I could cut x links off my new chain and it would work/fit/function, I would cut it off in the beginning because 1. I am lazy and don't want to rivet my chain twice in its life, and 2. Master links are not free, and I, unfortunately, am not independently wealthy. .....but again, your bike, your call
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post #10 of 18 Old 12-15-2015, 01:45 PM
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I didn't take links out of my chain because it was the original endless one and I wanted to keep it that way.
Once I hit the stops I will though, and at that time I'm going to fit a non-O'ring chain. which has less rolling resistance.
Not rocket science but an interesting mod all the same.

2013 CBR250R repsol (sold)
2014 CBR300R (sold)
2007 SV650 (track bike)
2004 XR250R (dirt bike)
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Last edited by kiwi rider; 12-15-2015 at 01:53 PM.
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