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Offline Claude

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Rear sprocket question
« on: September 29, 2018, 04:38:05 PM »
What’s the smallest sprocket that can be installed on the rear wheel? I mean, without creating any chain rubbing problem.

I know some here already fitted 41T and I’m wondering if smaller ones are possible or available.

I always install longer gearing on my bikes and intend to do the same on my V1000. I already have a 16T that I’ll install next winter, even if my bike will have about 7800 km.

Online Sonny

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Re: Rear sprocket question
« Reply #1 on: September 29, 2018, 05:59:56 PM »
Without going over a jillion posts on this subject, my impression is that 41 at the wheel is the lower limit with the stock length chain, and if higher ratio is still desired then you go up a tooth on the front.
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Offline longdog

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Re: Rear sprocket question
« Reply #2 on: September 30, 2018, 07:08:53 PM »
A rough rule-of-thumb is 1 extra tooth on the front, (gearbox drive), sprocket is equivalent to coming down 3 teeth on the rear wheel sprocket.
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Offline Claude

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Re: Rear sprocket question
« Reply #3 on: October 01, 2018, 12:06:34 AM »
FYI, JT do have sprockets for Versys 1000. Available sizes are:

Front: 14T, 15T, 16T, 17T, 18T and 19T. (strange as I think larger than 17T do not fit in the crankcase...).

Rear: 44T, 43T, 42T, 41T, 40T and 39T

With a 16T front, I won't go smaller than a 41T rear.

Offline Dannyboy1949

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Re: Rear sprocket question
« Reply #4 on: December 16, 2018, 05:24:50 PM »
Not knowing how the speed and distance info is sourced by the computer....will a gearing change affect the speedo/odo?
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Offline Floydsz1

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Re: Rear sprocket question
« Reply #5 on: December 16, 2018, 06:38:49 PM »
It does effect the gear indicator. It can't make its mind up which gear it's in.

Offline TowerMan

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Re: Rear sprocket question
« Reply #6 on: December 16, 2018, 06:48:10 PM »
*Originally Posted by Dannyboy1949 [+]
Not knowing how the speed and distance info is sourced by the computer....will a gearing change affect the speedo/odo?
This is taken from the front / rear ABS ring, so a change of front / rear sprocket sizes will not affect the speedo / odo, but

*Originally Posted by Floydsz1 [+]
It does effect the gear indicator. It can't make its mind up which gear it's in.

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Offline Dannyboy1949

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Re: Rear sprocket question
« Reply #7 on: December 16, 2018, 07:56:19 PM »
Thanks!!
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Online Sonny

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Re: Rear sprocket question
« Reply #8 on: December 16, 2018, 08:43:18 PM »
An electronic gear indicator has to work on a simple "if, then" software routine with numbers put in... in other words "if wheel speed (a) is a certain number, and engine rpm (b) is a certain number, then (c) is the gear number.

A sprocket change wouldn't break the indicator, it would just slew the numbers up or down and un-calibrate it.
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Offline Floydsz1

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Re: Rear sprocket question
« Reply #9 on: December 17, 2018, 11:39:01 AM »
*Originally Posted by Sonny [+]

A sprocket change wouldn't break the indicator, it would just slew the numbers up or down and un-calibrate it.

Correct, mine swops numbers without changing gear.

 



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