Corsara
Member
Speedometer wrong, odometer is spot on (calculations included)! Speedohealer dilemma..
Alright, I installed a -1 front sprocket, and I love it. Consequently, I've placed an order for a Speedohealer to correct the speed error for the changed gearing, as well as the factory error.
I did some measurements with GPS, as well as some software on my phone just to make sure I'm getting consistent results by both devices.
Here are my results for the speedometer:
Legend:
X = indicated speed on the bike
Y = indicated speed on the GPS
100 * (X - Y) / X = percentage correction
100 * 18 / 140 = 12.85%
100 * 14 / 120 = 11.66%
100 * 11 / 100 = 11%
100 * 7 / 60 = 11.66%
Here are the results for the odometer:
Trip 1: 42.7 km (bike) / 39.73 km (google maps): 100 * 2.97 / 42.7 = 6.95%
Trip 2: 27.0 km (bike) / 25.24 km (google maps): 100 * 1.76 / 27.0 = 6.51%
Conclusion (for stock bikes):
The odometer seems to be absolutely accurate (with stock sprocket). Only the speedometer has the factory error.
Speedohealer:
When I get it and install it, will it correct only the speed, or both the speed and odometer odometer? I've read the vague language in the official feature description of the product, but I'm asking if somebody actually can tell me first hand!
Needless to say, I (and everyone else considering the Speedohealer) have a pretty nasty dilemma:
CHOICE BETWEEN correct speed & incorrect odometer OR incorrect speed & correct odometer
Alright, I installed a -1 front sprocket, and I love it. Consequently, I've placed an order for a Speedohealer to correct the speed error for the changed gearing, as well as the factory error.
I did some measurements with GPS, as well as some software on my phone just to make sure I'm getting consistent results by both devices.
Here are my results for the speedometer:
Legend:
X = indicated speed on the bike
Y = indicated speed on the GPS
100 * (X - Y) / X = percentage correction
100 * 18 / 140 = 12.85%
100 * 14 / 120 = 11.66%
100 * 11 / 100 = 11%
100 * 7 / 60 = 11.66%
Here are the results for the odometer:
Trip 1: 42.7 km (bike) / 39.73 km (google maps): 100 * 2.97 / 42.7 = 6.95%
Trip 2: 27.0 km (bike) / 25.24 km (google maps): 100 * 1.76 / 27.0 = 6.51%
Conclusion (for stock bikes):
The odometer seems to be absolutely accurate (with stock sprocket). Only the speedometer has the factory error.
Speedohealer:
When I get it and install it, will it correct only the speed, or both the speed and odometer odometer? I've read the vague language in the official feature description of the product, but I'm asking if somebody actually can tell me first hand!
Needless to say, I (and everyone else considering the Speedohealer) have a pretty nasty dilemma:
CHOICE BETWEEN correct speed & incorrect odometer OR incorrect speed & correct odometer
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