Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-09-05, 02:04 PM   #1
Twitchology
I descend on my face
Thread Starter
 
Twitchology's Avatar
 
Join Date: Aug 2003
Location: The Land of Milk and Hoppy.
Bikes:
Posts: 93
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Computer installation

I picked up a Cateye Mity 8 for my fixie, but I noticed in the directions it has no place where it specifies how far from the center of the wheel it should be. Do I just put it anywhere and it figures out where the sensor is on the wheel?

Also, has anyone used the Mity vs. the Enduro? I have the Mity on my cross bike, but I was thinking I might want the beefier cord of the Enduro for the street. Anyone damage their cord before?
Twitchology is offline   Reply With Quote
Old 04-09-05, 03:07 PM   #2
2manybikes
Dog is my co-pilot
 
2manybikes's Avatar
 
Join Date: Jun 2003
Bikes: 2 many
Posts: 15,508
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
It does not matter how far from the center you put it. You get the same results.
2manybikes is offline   Reply With Quote
Old 04-09-05, 03:27 PM   #3
Twitchology
I descend on my face
Thread Starter
 
Twitchology's Avatar
 
Join Date: Aug 2003
Location: The Land of Milk and Hoppy.
Bikes:
Posts: 93
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Oh right because you put in wheel size.

I'm a genius, really.
Twitchology is offline   Reply With Quote
Old 04-09-05, 04:03 PM   #4
2manybikes
Dog is my co-pilot
 
2manybikes's Avatar
 
Join Date: Jun 2003
Bikes: 2 many
Posts: 15,508
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Quote:
Originally Posted by Twitchology
Oh right because you put in wheel size.

I'm a genius, really.
We geniuses need to stick together.

That's not the first time I've heard that, nor will it be the last.
2manybikes is offline   Reply With Quote
Old 04-09-05, 08:07 PM   #5
Portis
Banned.
 
Join Date: Sep 2003
Location: Home alone
Bikes: Trek 4300 X 2. Trek 1000, Trek 6000
Posts: 6,019
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I put my sensor as near to the hub as possible. I think I read that suggestion on Sheldon's site. Then my LBS decided to raise it up one day for no apparent reason. I guess they didn't like it that way.
Portis is offline   Reply With Quote
Old 04-09-05, 08:20 PM   #6
CommuterRun
Conservative Hippie
 
Join Date: Mar 2005
Location: Wakulla Co. FL
Bikes:
Posts: 4,271
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Oh cool, I'm a genius, too. At least that's what the wife calls me at times.
CommuterRun is offline   Reply With Quote
Old 04-10-05, 09:14 AM   #7
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,541
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 61 Post(s)
The only thing that the sensor does is to count wheel revolutions. The hub turns exactly the same number of times as the rim so height doesn't make any difference.

The biggest single problem with computers is getting the pick up the right distance from the magnet. Since the spokes angle inward from the hub flange to the rim, mounting close to the hub might put the magnet too close to the fork and mounting near the rim might move the magnet too far away.

I guess that technically you'll get less polar enertia by mounting the magnet close to the hub, but that force won't be enough that you'll ever feel it. If you have a large frame size, you might not have enough wire to do a neat installation if you try to mount the pickup too low on the fork.

I always try to mount the pickup in front of the fork. That way, if you ever bend something so that the magnet hits the pickup, the wheel rotation will just knock the pickup out of the way rather than jam it into the spokes.
Retro Grouch is online now   Reply With Quote
Old 04-10-05, 10:05 AM   #8
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah but you forget sheldons reasoning for putting it nearer to the hub.

Quote:
Originally Posted by Sheldon Brown
The closer in you mount it, the more slowly it will pass by the sensor, giving the sensor's magnetic switch more time to respond. If the magnet is too far out, the computer may give erratic readings at higher speeds.
operator is offline   Reply With Quote
Old 04-10-05, 05:13 PM   #9
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,541
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 61 Post(s)
Quote:
Originally Posted by operator
Yeah but you forget sheldons reasoning for putting it nearer to the hub.
Well, I've never encountered that problem, possibly because I don't ride fast enough to confuse that little reed switch.
Retro Grouch is online now   Reply With Quote
Old 04-11-05, 05:16 AM   #10
da_empire04
MudLover
 
Join Date: Nov 2004
Location: Melbourne, Australia
Bikes: Giant AC 2005, Custom BMX(no 2 parts from same brand) and no-name (but reliable) duallie
Posts: 56
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Twitchology
I picked up a Cateye Mity 8 for my fixie, but I noticed in the directions it has no place where it specifies how far from the center of the wheel it should be. Do I just put it anywhere and it figures out where the sensor is on the wheel?

Also, has anyone used the Mity vs. the Enduro? I have the Mity on my cross bike, but I was thinking I might want the beefier cord of the Enduro for the street. Anyone damage their cord before?

i also have the Mity 8. I bought it 3 days ago (Saturday). It says in the manual that the magnet must be within 5mm of the little black receiver thingy. On my bike ('05 Giant AC), the closer the magnet and reciever were to the hub, the less clearance there was between the two, so yes, I'd say that the magnet should be installed close to the hub for stronger magnet impulses (thats how the computer determines speed etc.).

Hope it helped
da_empire04 is offline   Reply With Quote
Old 04-11-05, 09:37 AM   #11
2manybikes
Dog is my co-pilot
 
2manybikes's Avatar
 
Join Date: Jun 2003
Bikes: 2 many
Posts: 15,508
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Quote:
Originally Posted by da_empire04
i also have the Mity 8. I bought it 3 days ago (Saturday). It says in the manual that the magnet must be within 5mm of the little black receiver thingy. On my bike ('05 Giant AC), the closer the magnet and reciever were to the hub, the less clearance there was between the two, so yes, I'd say that the magnet should be installed close to the hub for stronger magnet impulses (thats how the computer determines speed etc.).

Hope it helped

You can't generalize and say all computers should have the sensors close or far from the hub. The different brands and even models of the same brand have magnets and sensors that stick out or are closer to the spokes or the fork. And the forks are different and so are the wheels. Fortunately the distance from the center of the wheel means absolutely nothing to the computer. Some bikes must have the magnet and the sensor almost against the rim to have the magnet/sensor gap correct.

You just have to put them where the gap is correct from the magnet to the sensor. Period.
2manybikes is offline   Reply With Quote
Old 04-11-05, 10:45 PM   #12
dfw
Stercus accidit
 
dfw's Avatar
 
Join Date: Mar 2005
Location: Dallas/Fort Worth
Bikes: Trek Pilot 2.1
Posts: 686
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you have a wireless sensor and you place it close to the hub as Sheldon advises, the transmitter may be too far away from the receiver to work. My hybrid has a wireless computer and I have the sensor mounted high on the fork which is the only way it will work. On one large hill near my house I routinely get the bike as fast as 35 mph and have never noticed any erratic readings at those speeds.
dfw is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 12:55 PM.