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  1. #1
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    2006 Prophet 600 Question

    Dear fellow experts,

    I just purchased a very lightly used 06 prophet and love the bike! This is my first full suspension bike and pretty much my first mountain bike. I like to ride pretty aggressively and take a few small drops. My question to you guys is whether the stock rims (mavic xm117) are fine for aggressive riding? I have noticed that my rear rim is already not true and my front is on its way after only 4 rides. Also my second question is my front tire started to lightly squeak. This squeak is not from the disk rubbing the break, but sounds like its coming from the inside of the hub. Any ideas what this could be?

    Any help will be greatly appreciated.

  2. #2
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    eh? It's expert singular and that's Mendon

    is whether the stock rims (mavic xm117) are fine for aggressive riding?
    Well Mavic naming system is basically the 1st number indicate the quality of the rim, and the second two number are the width.
    Unfortunately 1 is not the best.. but the lowest in there chart, 8 being the 'best' (that doesn't mean to say it rubbish, just their 'budget' rim)
    17(mm) is the std size of an XC rim, you would want a 19-21+ (mm) to be able to fit a decent width tyre (eg: 2.4) on the rim without it risk of it rolling off.

    So, realistically I'd just run the wheelset until either the rear hub dies or the rims go out of true or are too badly damaged. Unless your planning to extend your riding into bigger stuff in a hurry.
    Then get some 519 or 719's (assuming you don't want/need UST) or some of the Stan rim's which recieve some glowing reviews.
    Beware of going too 'heavy hitter' on the rim front, as I found a set of 729's to be a major draw back considering my riding sytem ('mincing') & an expensive to change back to some more sensible 819's.

    my front tire started to lightly squeak....
    Eh?

    but sounds like its coming from the inside of the hub
    oh... sound like your hub bearings may need replacing, should be thread on here on how to do it, pretty sure I've seen the bearing for sale on ebay (or elsewhere)

  3. #3
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    The stock 117 rims are rubbish. You can have the front Lefty hub laced up with a good rim and spokes. Sounds like you need to replace the front hub bearings. Very easy to do.

    I have a Mavic 819 laced to the front hub, and a Mavic Crossride (semi cheap) on the rear. The 819 never goes out of true, and the Crossride only requires minor adjustments on occasion.

    I destroyed the 117 wheels early on. You will notice the difference with a stiffer wheelset, especially the front.

    Do you still have the Trailbears for tires? I switched to WTB Weirwolfs and found them to be better for New England rocky, rooty stuff.

    If you still have the Radium shock, you might want to upgrade to either a Manitou with SPV (I have the 3-way with SPV) or a Fox with Propedal.

    Learn how to do a bearing reset on the Lefty (easy to do) and if it needs service, send it to Mendon!

    Good luck with the new ride!
    My name is Chris and I ride a Prophet 650b with a Lefty.

  4. #4
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    As parts wear out - replace by upgrading. Put new bearings in the front hub. An RP23 shock is better than the Radium although the Radium is OK till youve done a bunch. The TrailBears are ok but when they wear out - Maxxis Advantage are good. I put Shimano DX Flats on and when my rear hub wore out,I replaced it with an XT. The brakes are fine. At least you dont have to bleed em. I have the same bike and I've put many miles on it. A perfect AM. Just let the weight weenies be and remember that its a tough bike that rides as good as any heavier AMs these days.

  5. #5
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    Thanks for the help guys! I just bought some bearings off ebay so will replace those once i get them. I have a fox float r, not sure if that is good or not? As for the rims I guess i will just continue truing them and keep my eye open for any good deals. The bike also came with Trailbears so will be replacing those once I get some funds saved up.

    Any suggestions on routine maintenance? All that I have been doing is keeping the chain/derailleurs clean and lubed. Should I be concerned with he pivot joints and when do I know i need to reset the bearings on the lefty?

  6. #6
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    Do a search for "The Lefty Bearing reset thread". It is in the Cannondale forum. There is a set of pictures and instructions that start the thread. Very easy. There is a measurement from the center of the Lefty hub to the crown when the bearings are in the right place. I forget what it is, but there is a range that is OK. After that, you need to do a reset.
    My name is Chris and I ride a Prophet 650b with a Lefty.

  7. #7
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    I have a fox float r, not sure if that is good or not?
    To be honest that's a very decent shock considering the basic rims. It might not have all the much in the way of external adjustment but don't let that fool you. They can be tuned to increase the Pro-pedal setting & generally tuned to your style of riding by a suspension specialist or upgraded with a 'PUSH' tune to get a better overall feel.
    Yes you could replace it with an RP23 or coil shock but unless it causing you issues, set the sag, play with the rebound till your happy and get on and ride.
    (Do not let anyone convince you a Manitou 3 way shock as a better shock.. it ain't)

    Any suggestions on routine maintenance All that I have been doing is keeping the chain/derailleurs clean and lubed
    Frame wise that's all I do, others might be more pro-active but my 2006 Prophet just keeps going, no sign of issue with the bearing/pivots, the lefty and fox shock will require a little more fettling/servicing to keep them in tip top condition though. As per Julio, search out the lefty bearing reset thread on how to do that, covers it in more detail than we could quickly.

  8. #8
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    Those rims suck. i pancaked a set on my prophet 5 jumping curbs. I got a set of UST 819 tubeless and i do jumps 3-4 ft all the time. They hold up just fine.

    karl

  9. #9
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    What ever you do..don't end up getting the 823! They will seem very tempting with the 23mm internal width, but you will literally be dragging 2600 gram wheelset around. They are absolutely amazing, but the weight a real killer. When this set go look for a 21mm internal width rim if you climb a lot and if you do mostly downhill then go with the 23mm internal.

  10. #10
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    Haha! That's exactly what I did - I went with the 823's. It was only after purchasing the 823's that I tried to fit 2.35" maxxis tires on my other bike with 819's and realized they paired up fine. I would've gotten 819's instead of the 823's if I could turn back time.

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