Wierd max speed on cyclometer
#1
Senior Member
Thread Starter
Join Date: Jun 2005
Posts: 1,184
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Wierd max speed on cyclometer
This has happened to me when using both wireless and wired Cateye cyclometers. Now and again, I'll return from a ride, check to see what my max speed was for the ride, and find a reading that defies reality - like 89 mph, 97 mph.
What might be causing these erratic readings?
Thanks.
Caruso
(I, of course, try to maintain forever those readings when they occur to show my non-biking fans just how tough a rider I really can be!!)
What might be causing these erratic readings?
Thanks.
Caruso
(I, of course, try to maintain forever those readings when they occur to show my non-biking fans just how tough a rider I really can be!!)
#3
Young and unconcerned
Join Date: Apr 2006
Location: Merry Land
Posts: 4,123
Bikes: Yeah, I got a few.
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I've heard of problems like that happening with wireless cyclometers, though not wired ones... Perhaps you rode through something very magnetic? Past an electrical substation? Under high-tension power lines??
#5
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
Older model Cat-Eyes like the Solar were prone to this problem even though they were wired. A friend had one and he would get occasional readings like you report.
I have experience with at least a dozen newer wired Cat-Eyes (Enduro, Astrale and Mity in various series) on my own and friend's bikes and have never seen or heard of the problem with any of them.
I have experience with at least a dozen newer wired Cat-Eyes (Enduro, Astrale and Mity in various series) on my own and friend's bikes and have never seen or heard of the problem with any of them.
#6
Senior Member
Thread Starter
Join Date: Jun 2005
Posts: 1,184
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Originally Posted by WorldPax
Where is your celphone when this happens?
Caruso
#7
Senior Member
Join Date: Jul 2005
Posts: 7,487
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
Liked 162 Times
in
89 Posts
I noticed this problem, too, recently. I've got a Cateye wireless (a little more than a year old), and after descending a long hill the other day, I wanted to check to see what my max speed had been. Usually, I hit around 40-43mph coming down this particular hill. But when I checked it this time, it said 77mph! I've never had any problems with this cyclometer, I didn't have a cell phone with me, etc. Weird.
#8
Senior Member
Join Date: Jun 2003
Posts: 18,138
Bikes: 2 many
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 1266 Post(s)
Liked 323 Times
in
169 Posts
The sensor on the fork is just a little switch that gets pulled over by the magnet as it goes by. They can bounce and give extra pulses making it seem like you have a higher speed. It happens more at high speed because the bumps are harder and higher frequency. It can happen more as the switch gets older. The return spring can weaken with age. It's nothing to worry about, no damage has occurred.
#9
Senior Member
Join Date: Jun 2006
Location: Lansing, IL
Posts: 246
Bikes: Fuji Grand Fondo 2.0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I have seen this with the computer in the back seat of my car with antilock breaks. The wheel lock up is detected in much the same way as the cyclometer. A magnet and a switch.