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  1. #1
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    The lefty speedo mounting thread.

    Yes, for our riding pleasure on our lefties. Please post pictures of how you would mount your sensor on your lefty fork and what speedometer you're using on your cannondale. I haven't got a slightest clue how I would mount my cateye "cordless 7" on that lefty but as soon as I get a consensus i'd do so.

  2. #2
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    just search the older threads,theres a ton of info on several different mounting configurations.
    I hate to advocate weird chemicals, alcohol, violence or insanity to anyone… but they've always worked for me," . Hunter S Thompson

  3. #3
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    Quote Originally Posted by DubOne
    just search the older threads,theres a ton of info on several different mounting configurations.
    I did, but nothing came out. Maybe you can post a list of keywords to use for the search? thanks

  4. #4
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    Key word "lefty computer" try search title first then search the whole post. you most likely will find couple post that talk about the mounting method. What kind of mount does your computer come with, zip tie or bracket? if it is zip tie, just zip tie it with your boot, that is what i did. i have a cateye OS so it might have the same type of mount. if you want to see pic, search for some of my post and they have the pic on it.

  5. #5
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    Mount A Small Magnet, With Crazy Glue, On The Brake Rotor

  6. #6
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    Quote Originally Posted by C-dog
    Mount A Small Magnet, With Crazy Glue, On The Brake Rotor
    ok, thought of that and now that you mention it, I think that will be a better way to do it. anyone tried self adhesive tape on the magnets over "crazy glue" mentioned by c dog?

    But in my not so humble opinion, is it safe to mount the sensor on the front part of the fork? I personally do not think so as it would get hit by any rocks or branches and fall off.
    2 cents :P

  7. #7
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    Quote Originally Posted by Atomant
    ok, thought of that and now that you mention it, I think that will be a better way to do it. anyone tried self adhesive tape on the magnets over "crazy glue" mentioned by c dog?

    But in my not so humble opinion, is it safe to mount the sensor on the front part of the fork? I personally do not think so as it would get hit by any rocks or branches and fall off.
    2 cents :P
    Mavic makes a slim-line magnet that will put a hole in your wallet. With a box knife you can shape it so it will fit on the rotor of a hayes...it will probably work on any rotor. Your BIG problem on a cordless is the transmit distance. I have not found one that will do the job correctly when located near the axle. It works for a while but when the battery is not 100% then its intermittent basd on your fork compression. I am told vetta is ok but for me.... seeing is believing on this one !

    What works for me is bend a bracket to hold your transmitter and bolt that bracket to the top most bolt of your brake caliper. Works a charm for me now I have found the x-section size of aluminium that wont vibrate too much. I'll post a photo over easter.
    R.I.P 26ers....

  8. #8
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    Quote Originally Posted by yiucycle
    Key word "lefty computer" try search title first then search the whole post. you most likely will find couple post that talk about the mounting method. What kind of mount does your computer come with, zip tie or bracket? if it is zip tie, just zip tie it with your boot, that is what i did. i have a cateye OS so it might have the same type of mount. if you want to see pic, search for some of my post and they have the pic on it.
    Zip tie mount.
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  9. #9
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    I have a Cateye Enduro 8 computer. I saw no need to try and force fit the sensor onto the Lefty, so I opted to get the Mity 8 sensor kit with the super-long cable. I wrapped the thin cable around my rear hydraulic brake cable, mounted the sensor on the rear swingarm of my Jekyll, and slapped the magnet on my rear wheel.

    Works like a charm, problem solved.

  10. #10
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    Quote Originally Posted by SpinWheelz
    I have a Cateye Enduro 8 computer. I saw no need to try and force fit the sensor onto the Lefty, so I opted to get the Mity 8 sensor kit with the super-long cable. I wrapped the thin cable around my rear hydraulic brake cable, mounted the sensor on the rear swingarm of my Jekyll, and slapped the magnet on my rear wheel.

    Works like a charm, problem solved.
    I am trying like the devil to avoid unncessary cables. I'm so stubborn on that one that I manufactured a number of mounts and bought a number of computers until I found something that works. Kind of anal I know, but for some reason I cant bear the sight/thought of extra cables !!! I need to get a life.
    R.I.P 26ers....

  11. #11
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    Quote Originally Posted by The_Missile
    I am trying like the devil to avoid unncessary cables. I'm so stubborn on that one that I manufactured a number of mounts and bought a number of computers until I found something that works. Kind of anal I know, but for some reason I cant bear the sight/thought of extra cables !!! I need to get a life.
    Thing is, you don't see this extra sensor cable 'cause it's wrapped tightly around the rear brake cable. It's practically invisible. I'd post pictures of it if you want. I'm really happy with the setup as I wanted to maintain one computer only and I knew that I wanted to use a wired setup in order to avoid any external interference.

  12. #12
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    Good job! The perfect solution

    Have a look at "http://www.maliceonline.com/lefty___seb_4973.php". maybe a little bit pricy but definitely the perfect way to mount a sensor to your lefty.

  13. #13
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    Quote Originally Posted by joschi
    Have a look at "http://www.maliceonline.com/lefty___seb_4973.php". maybe a little bit pricy but definitely the perfect way to mount a sensor to your lefty.

    my set up works great--it was suggested to me by a Cannondale team rider, Cateye Enduro 2 with pickup on the fork and mag on the rotor

  14. #14
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    my set up
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  15. #15
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    Quote Originally Posted by C-dog
    my set up
    hrr hrr hrr, just mounted my cordless 7 with no brackets at all. will post it up later tonight for critiques....

  16. #16
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    alright guys, here are some pictures of how I mounted my cordless 7 computer with the standard mounting kit on my f800 and rode 70km on and off road without any problems. Spot any flaws? anyway I would've made it better?
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  17. #17
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    Quote Originally Posted by Atomant
    alright guys, here are some pictures of how I mounted my cordless 7 computer with the standard mounting kit on my f800 and rode 70km on and off road without any problems. Spot any flaws? anyway I would've made it better?
    I know I'm referring to an old post but did your speedo mounting system work. I'm trying to fit a cateye cordless as well but was worried that the distance from the sensor to the speedo might be too much (recommended less than 700mm).

    When I tried mounting the sensor by youyr method I also found that the sensor was a fair way away from the magnet - was this a problem for you.

    As I've got the Marta SL's I don't have the additional post bolts that other brake systems have so I can't mount a bracket to the brake bolts.

    Any help would be appreciated.

  18. #18
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    C-dog, did you have to grind off some of your magnet? I don't have enough clearance to get past the arm if i just cut the threads off the back. I have a Cateye that I'm trying to mount on mine.
    Let's Ride!!!

  19. #19
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    Actually I have the same setup as C-Dog with a Sigma Sport BC1600 wired sensor and a Cateye magnet I got by opening up a Astrale cadence magnet casing. I just superglued the chromed magnet to my disc rotor (Magura 180mm) at around the same spot as C-Dog, no mods needed. I find that's the best magnet to use cuz it's very low profile, chromed so the magnet is protected unlike bare black ones that tend to chip. Had this setup on my F800 / Lefty DLR Ti since October and works like a charm.

  20. #20
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    It's a magnet that's supposed to mount to the spokes but it has a screw on the back of it. I'll put up pics later unless you know what I mean. It's not just a magnet alone. Testing with the magnet just stuck to the disc it hits the arm. I need a little off for it to pass by the arm where his is located.
    Let's Ride!!!

  21. #21
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    I have found using mavic zircal (flat blaed spoke) magnets work very well with the rotors

  22. #22
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    buy a lefty computer mount..its a lil less than $20, so ur bike will b all original!!!!

  23. #23
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    use an enduro 8 and run the wire down the brake line, besure to check the routing while compressing the suspension.

    mount the sensor on the upper disk brake mount, not where the adapter mounts to the fork but rather where the adapter mounts to the caliper. the sensor will be mounted horizontally but it will work fine. mount the magnet as you normally would on the spokes.
    Large hills tell only truth

  24. #24
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    Quote Originally Posted by akhoundog
    use an enduro 8 and run the wire down the brake line, besure to check the routing while compressing the suspension.

    mount the sensor on the upper disk brake mount, not where the adapter mounts to the fork but rather where the adapter mounts to the caliper. the sensor will be mounted horizontally but it will work fine. mount the magnet as you normally would on the spokes.
    Yep, like so. Have been running it like this fine for close to a year now; it's easy and, best of all, free.
    Attached Images Attached Images

  25. #25
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    Cordless 7 on Lefty MAX

    Hi everybody!

    I've studied this thread and manufactured my own holder for cordless7 from kid's meccano just in five minutes. It's fixed on upper caliper bolt and holds sensor perfectly well!

    One problem I faced now: the distance between the computer and sensor is too big. When I hold the comp just 5 cm lower the handle bar everything works, when I put it into it's cradle onto handle bar it loosing the signal.

    Does it look normal? Got any ideas?

  26. #26
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    Ok....ditch the magnet that comes with the unit. Grab that old computer sitting in the corner for years and relieve it of its CDrom. Pull the lens assy. out of it. You will see that the lens can move slightly up and down, well thats for focusing and its coil/magnet driven. Pull those magnets, put one on your fridge door and the other on the leg of the rotor. These little magnets are so damn strong you might not need any adhesive, but I used epoxy. Special glue for setting rear view mirrors in cars is strong, at local auto store. Computer sensor fits nicely below the rubber boot. The cateye wireless is too far away on bar, so made a bracket to mount on lefty tube using and old reflector bracket with the straight piece used for two tie wraps, you'll see. Rotate as needed to read the display.

  27. #27
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    Quote Originally Posted by Mtbrat
    I have found using mavic zircal (flat blaed spoke) magnets work very well with the rotors

    i did this also. works great, no goofy brackets etc. I used a wired enduro. My wireless from my road bike wouldn't reach.

  28. #28
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    I am using the Cateye Micro wireless with tha Mavic magnet mounted to blade on brake rotor. Sensor is mounted to fork with some double-sided ext tape and one tie strap. Look closely for mag mouted to rotor.

  29. #29
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    There are several options for mounting a wireless computer on a lefty fork:

    1. use a mavic magnet for flat spokes (costs 9.95 usd) and put in on the disc rotor; this works fine for most rotors (shimano, hope floating), except formula oro rotors.

    2. use a sigma powermagnet (cost 4.95 usd), whcih allows you to have more distance between the magnet and the speed sensor (maximum distance is 12 mm instead of 3-5 mm)

    3. For formula oro or other rotors on which the abovementioned magnet does not fit, you can order a small flat magnet at www.powermagnetshop.de. I ordered the round 10mm x 1 mm magnet, and this works fine (see picture/post of c-dog, it is the same size of magnet)

    4. Buy the polar cs600 with WIND speed sensor, and mount the sensor on the rear wheel. The WIND sensor can handle much more distance than the 70cm limit of most wireless speed computers

    Greetz
    Ron

  30. #30
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    Hi Guys. Has anyone used the Lefty computer mount from Cannondale?
    http://www.cannondale.com/a_a/gear/0...el-8CM01.html#

  31. #31
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    Yes I do, works great

  32. #32
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    Hi guys,

    Here are some pictures of the mounting of a Cateye Strada Wired computer on a lefty fork.
    I mounted the receiver on the back of the Lefty instead of the front side, which in my humble opinion looks nicer.


    Greetz
    Ron

    DSC00809.JPG

    DSC00811.JPG

    DSC00810.JPG

  33. #33
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    ahhh!

    if I am mounting the magnet on the disc.

    its a 160mm disc.

    what wheel measurement do I put on the cateye?????

  34. #34
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    Use the normal measurement for your wheel/tire. Where the sensor is mounted along the radius doesn't matter. BTW... Cateye Double wireles, or Edge products eliminate these problems, as the sensor is rear wheel mounted.

  35. #35
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    "Common sense isn't always that common!"
    Custom Prophet and Custom Delta V

  36. #36
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    Quote Originally Posted by citybiker
    Use the normal measurement for your wheel/tire. Where the sensor is mounted along the radius doesn't matter. BTW... Cateye Double wireles, or Edge products eliminate these problems, as the sensor is rear wheel mounted.
    What he said. The computer counters the number of revolutions per minute. So if it's at the rotor or at the rim, the RPM is the same. It just needs to know circumference....
    CDT

  37. #37
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    Hey guys, I just picked up my first Lefty bike.

    I bought a Specialized computer and had the LBS mount it for me. He epoxied the magnet onto the rotor.

    Only problem now is the rotor has been magnitized and It's reading 46mph while I'm walking it across the parking lot. Has anyone else dealt with that?

  38. #38
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    Quote Originally Posted by traffic002
    Hey guys, I just picked up my first Lefty bike.

    I bought a Specialized computer and had the LBS mount it for me. He epoxied the magnet onto the rotor.

    Only problem now is the rotor has been magnitized and It's reading 46mph while I'm walking it across the parking lot. Has anyone else dealt with that?
    I've done the magnet on the rotor thing on about 10 bikes and have never had this problem. I don't know how you would go about demagnetizing the rotor. But at the same time i doubt the magnet is actually magnetized. It should be hard to magnetize stainless enough for the computer to pick it up. Sure the wheel size is set right? Maybe a smaller magnet? I use small rectangular rare earth magnets they are 1x4x19mm and fit nicely on the rotor arm.

  39. #39
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    Smaller magnet? Hmm...this might be a good solution as I've found the problem to be intermittent. It'll read 8mph correctly, then it'll read 60... So it's not like I can just adjust the diameter of the wheel for the 7 additional readings per rev.

    I really don't care how fast I am going as I'm too busy concentrating on the trails. But wouldn't mind tracking how far I've ridden. Otherwise, this computer is useless to me.

  40. #40
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    Quote Originally Posted by UrbanPounder
    Ok....ditch the magnet that comes with the unit. Grab that old computer sitting in the corner for years and relieve it of its CDrom. Pull the lens assy. out of it. You will see that the lens can move slightly up and down, well thats for focusing and its coil/magnet driven. Pull those magnets, put one on your fridge door and the other on the leg of the rotor. These little magnets are so damn strong you might not need any adhesive, but I used epoxy. Special glue for setting rear view mirrors in cars is strong, at local auto store. Computer sensor fits nicely below the rubber boot. The cateye wireless is too far away on bar, so made a bracket to mount on lefty tube using and old reflector bracket with the straight piece used for two tie wraps, you'll see. Rotate as needed to read the display.
    That is a serious Ninjitsu McGuyver idea that worked perfectly, the magnet is the perfect size for disk mounting as well, Thanks

  41. #41
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    Quote Originally Posted by ChefJ
    That is a serious Ninjitsu McGuyver idea that worked perfectly, the magnet is the perfect size for disk mounting as well, Thanks
    Your welcome. Now I have to mount one on a bad boy fatty fork setup. Only a sensor bracket problem though.

  42. #42
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    I have a Cannondale Rush whith a Lefty DLR 2, and i use a Sigma 906 BC. I had to remove the magnet from its casing, because there wasn't enough room available betewn the disc and brake caliper:
    Last edited by JG_CAAD; 08-23-2009 at 12:05 PM.

  43. #43
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    I am using the 88+ mount with a Sigma 1606L wireless computer and no problems at all with reception. Now im running a Garmin 705 but still have the Sigma wheel sensor on the bike but sending a signal to nothing.
    Bikes: 2008 Cannondale Rush 4, 1994 Trek 930SHX, 2009 Scott CR1 Team Issue

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  44. #44
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    The C-dale mount works like a charm; costs about $20. Sensor mounts to top post, bottom attaches to lefty.


  45. #45
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    Quote Originally Posted by zaphod123
    The C-dale mount works like a charm; costs about $20. Sensor mounts to top post, bottom attaches to lefty.

    I got one of those too because I had to have this matching red computer.


  46. #46
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    Cateye wireless V2 or V3. Sensor mounts on rear swing arm. Problem solved!

    Now on that note has anyone used one on their mountain bike?? I am thinking of getting one for my lefty?

    Mav
    Last edited by Mavrik; 12-13-2009 at 09:05 PM.

  47. #47
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    Quote Originally Posted by citybiker
    Use the normal measurement for your wheel/tire. Where the sensor is mounted along the radius doesn't matter. BTW... Cateye Double wireles, or Edge products eliminate these problems, as the sensor is rear wheel mounted.
    Has anyone used the new Cateye V2 Or V3 2.4ghz rear mounted sensors on their mountain bikes? I am worried they may cop a hiding being rear mounted mountain bike riding???????????????????????????

    Mav

  48. #48
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    The lower Lefty brake mounting bolt tip was only a couple of mm's away from the rotor. When I mounted the flat Mavic wheel magnet to the rotor, it kept hitting the end of the bolt. I had to add an additional washer so the bolt tip was flush and not protruding at all.

  49. #49
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    Cannondale lefty speedo mount bracket 8CM01/BLK

    Here it is...!
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