Cateye Micro Wireless speed incorrect
11-02-14 | 05:35 AM
#1
Thread Starter
Old Peddler
Joined: Nov 2011
Posts: 54
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From: Houston Texas area
Bikes: Trek Marlin 8
Cateye Micro Wireless speed incorrect
I installed a New Cateye CC-MC200W
Micro Wireless on my New Rockhopper 29. I set the wheel diameter at 2288 as per the instructions.
I've checked it against 2 seperate GPS units and it consistently read 2 mph slower,
Any ideas? Could I adjust the numbers up or down a little to correct?
thank you
Dave
Micro Wireless on my New Rockhopper 29. I set the wheel diameter at 2288 as per the instructions.
I've checked it against 2 seperate GPS units and it consistently read 2 mph slower,
Any ideas? Could I adjust the numbers up or down a little to correct?
thank you
Dave
11-02-14 | 07:24 AM
#4
Senior Member
Joined: Mar 2012
Posts: 1,968
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From: Minnesota
Bikes: '09 Trek 2.1 * '75 Sekine * 2010 Raleigh Talus 8.0 * '90 Giant Mtb * Raleigh M20 * Fuji Nevada mtb
You probably have a "custom wheel size" option, us that instead of the presets. Make a change, ride, check, change, ride, check .... until it's averaging the same as the GPS. You will always get some variation, but it will be both > and <.
I do this on my road bikes, using my phone cycling app, and most of the time the same rides come in within 1 %, other times they are 5% or so. Depends on the GPS signals at the time.
I do this on my road bikes, using my phone cycling app, and most of the time the same rides come in within 1 %, other times they are 5% or so. Depends on the GPS signals at the time.
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FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
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FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
Last edited by RoadTire; 11-02-14 at 07:38 AM.
11-02-14 | 07:36 AM
#5
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Joined: Dec 2010
Posts: 8,951
Likes: 14
Or: Measure the actual circumference of the tire using the roll-out method. Stand the bike up on a smooth surface. Position the wheel with the sensor with the valve stem at the bottom. Mark the floor directly below the valve stem, roll the bike forward one wheel rotation and mark the floor when the valve is again at the bottom. Measure the distance between the marks to get the tire circumference. Weighting the bike as it would be while riding will improve the accuracy and yield a slightly lower number, roughly 1% lower.
11-02-14 | 07:38 AM
#6
Senior Member
Joined: Mar 2012
Posts: 1,968
Likes: 1
From: Minnesota
Bikes: '09 Trek 2.1 * '75 Sekine * 2010 Raleigh Talus 8.0 * '90 Giant Mtb * Raleigh M20 * Fuji Nevada mtb
Looigi is correct - that works too.
Alternate methods, obsessions, and general attitude are described in this thread. Pretty entertaining:
confused about calibrating bike speedometer
Alternate methods, obsessions, and general attitude are described in this thread. Pretty entertaining:
confused about calibrating bike speedometer
__________________
FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.
11-02-14 | 10:17 AM
#7
Junior Member
Joined: Aug 2014
Posts: 193
Likes: 20
From: Halifax, NS
Bikes: 2005 Peugeot Evasion 2019 Trek Verve
This
Or: Measure the actual circumference of the tire using the roll-out method. Stand the bike up on a smooth surface. Position the wheel with the sensor with the valve stem at the bottom. Mark the floor directly below the valve stem, roll the bike forward one wheel rotation and mark the floor when the valve is again at the bottom. Measure the distance between the marks to get the tire circumference. Weighting the bike as it would be while riding will improve the accuracy and yield a slightly lower number, roughly 1% lower.
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