Author Topic: 16 tooth sprocket question?  (Read 2318 times)

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Offline PeterS

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Re: 16 tooth sprocket question?
Reply #20 on: September 21, 2020, 05:01:02 PM
I am also thinking about changing to 15/39 or 16/41. But I was thinking.... what happens to the accuracy of the speedometer? Is the speed signal picked up in the gearbox or by an abs sensor?

Offline KennyV

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Re: 16 tooth sprocket question?
Reply #21 on: September 21, 2020, 05:22:18 PM
*Originally Posted by PeterS [+]
I am also thinking about changing to 15/39 or 16/41. But I was thinking.... what happens to the accuracy of the speedometer? Is the speed signal picked up in the gearbox or by an abs sensor?

With my 2020 16 / 41(non abs), the speedometer is surprisingly accurate up to 30 - 40 mph. At 50+ the speedometer is 4 - 5 mph slower than what my GPS shows.
71 Z50 Minitrail, 72 Yamaha RT2 360, 74 Yamaha DT250A, 20 CB500X

Offline PeterS

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Re: 16 tooth sprocket question?
Reply #22 on: September 23, 2020, 04:32:24 PM
*Originally Posted by KennyV [+]
With my 2020 16 / 41(non abs), the speedometer is surprisingly accurate up to 30 - 40 mph. At 50+ the speedometer is 4 - 5 mph slower than what my GPS shows.

That is a lot at 50+. I have a 2018 bike with abs. Since there are non-abs bikes I guess the speed is picked up in the gearbox. It is hard to imagine that there are two different ways of picking up the speed....
I tested the deviation on my bike yesterday with a pillion holding a gps by hand. 107 - 108 km/hour on the dash was a 100 km/hour on the gps. So I guess with a 16 tooth sprocket my bike would be very accurate.


Offline bdg

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Re: 16 tooth sprocket question?
Reply #23 on: September 24, 2020, 12:55:30 AM
My 2017 ABS version was always reading too high before the sprocket change.  Almost perfect with the larger drive sprocket, as compared to a GPS.

Offline Steve T

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Re: 16 tooth sprocket question?
Reply #24 on: September 24, 2020, 07:36:42 PM
The speedo on my 16thd bike is fractionaly - and I mean fractionally - lower at 60mph than the gps indicated speed. Maybe 1mph under.
At lower speeds it is virtually bang on the gps speed.

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Offline PeterS

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Re: 16 tooth sprocket question?
Reply #25 on: September 26, 2020, 10:40:49 AM
OK. Looks like it is worth a try to step to the 16 tooth sprocket. I will order one, and post back when i tried it.

Offline PeterS

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Re: 16 tooth sprocket question?
Reply #26 on: October 04, 2020, 04:58:35 PM
I have received the 16 tooth sprocket last week and installed it yesterday. Today is a relatively dry day but there is a lot, really a lot, of wind ( > 4 bft), so I did my test drive anyway.

The speedometer is 1 km/h faster than my gps at a 100 km/h. Even at 150 km/h on the German Autobahn, the speedo matched the gps. within 1 km/h. That's nice! With new tires the speedometer might be spot on! So in this regard, the new sprocket is ok: no speeding tickets due to an underestimating speedo should be expected.

I have to say that I have to get used to the new gearing. The first gear is small enough for me. The sixth gear is a lot bigger, resulting in a big amount of rpm's less, certainly at higher speeds. But where the bike was very agile in deploying power when you opened up the throttle in sixth gear, now you have to grant the bike some time. When you need to be fast, you really have to change one, or two, gears down. Which is ok for me. But I am curious what happens when I put panniers on the bike. That is something for in the summer of next year.

So for now I leave the 16 tooth sprocket on the bike and learn how to ride it. The agility might be better with less wind than today. There was really a lot of wind from the side today. When agility with or without panniers is not sufficient, I might try a 15/39 gearing when the chain needs to be replaced.


Offline Swanny

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Re: 16 tooth sprocket question?
Reply #27 on: October 04, 2020, 06:25:46 PM
Thanks Peter  :002: you've made my mind up about fitting a 16 tooth.

No thanks I'll stick with what I've got  :018: I don't want to lose power for the sake of a longer 1st gear
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Offline denislordm

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Re: 16 tooth sprocket question?
Reply #28 on: October 05, 2020, 01:40:10 PM
This is just My opinion.....................but a 16T front sprocket is I feel a step too far / I fitted a 39T rear sprocket instead and have a noticeable difference in a longer 1st gear / but little difference in top end speed or when overtaking.
Speedo and GPS read almost indentical the speedo perhaps 1 mph faster than GPS until 50 mph ish.
I occasionally have a passenger like last year I took my daughter to Germany for a week and managed perfectly well on all roads including autobahns. with panniers and topbox packed full.
The best bit is getting better MPG with this gearing than standard.

As I said though this is just My opinion.  :002:

Offline kmsz

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Re: 16 tooth sprocket question?
Reply #29 on: October 05, 2020, 05:53:16 PM
I installed mine last week, also a 16th and in the first ride I felt a noise in the frt sprocket area, but then it disappeared. Has this happened to anyone?
Perhaps the chain was being properly accommodated to the sprocket? Or you think that it is something that I should be concerned about and should take out the plastic lid to check?