pc1978
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Registered: Jan 8, 2020 15:51:27 GMT -7
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Post by pc1978 on Feb 25, 2020 14:39:33 GMT -7
So I saw the R1 sprocket thread and it got me curious. I bought my bike used and the previous owner had put a Vortex sprocket and EK 3D chain on it. Never even occurred to me to check the size, so just did, and sure enough it’s a 45 tooth (engraved on it). Checked the front and its still 16. I’m not wheelie “skilled,” but do like to get hard on the throttle and it hasn’t seemed too crazy. I have been riding in TCS 2 mostly and weigh 200 lbs without gear and like to sit up near to the tank. It does lift the front end when on the throttle but sets it back down fairly quickly and as I stated, I don’t try to ride them out. I seem to like it and don’t do a lot of long highway miles so will probably keep it like this when it’s time for a new chain/sprockets. But this now made me wonder is the speed read on the ABS ring or at the drive shaft? And if it’s read off the front wheel, does the sprocket change affect the speedometer? If the speedometer is off, it is showing a higher speed than I am actually going if I am thinking about it correctly. Which probably keeps me safer from tickets (when I’m riding within reason of the speed limit or with the flow of traffic). But would be nice to have it close to accurate.  |
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harry76
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Registered: Sept 13, 2016 17:25:41 GMT -7
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Post by harry76 on Feb 26, 2020 6:02:39 GMT -7
The 10s use the wheel ABS sensors to monitor speed, I assume it uses the rear to feed the speedometer.
I believe the speedo signal actually comes from the ABS module.
I have included a link in the post below.
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harry76
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Registered: Sept 13, 2016 17:25:41 GMT -7
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Post by harry76 on Feb 26, 2020 6:17:36 GMT -7
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pc1978
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Registered: Jan 8, 2020 15:51:27 GMT -7
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Post by pc1978 on Feb 26, 2020 6:34:04 GMT -7
Ok, thanks for the info.
So if I’m understanding this style of speed sensor correctly, then sprocket changes will not affect the speedometer reading.
Of course it could be (and likely is) off a bit from the factory, but different size sprockets won’t cause any additional variation.
I had a Honda 919 that was well know to be about 10% off.
A common mod was to go to 17/44 sprockets (OEM was 16/43) for a bit smoother throttle and ride and lower rpm cruising.
A side benefit was that it got the speedometer pretty close to accurate.
Of course being me I went the other way 15/43. I loved the added acceleration, but my speedo was probably at least 15% off at that point.
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