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Thread: RC4 on HD????

  1. #1
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    RC4 on HD????

    Just curious to find out how the RC4 feels on the HD. I know there are a few people out there who are running them and I'm thinking about switching out my order from a RP23 to the RC4... also does anyone know what the wieght difference is?

  2. #2
    MPI
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    Anyone considered Dueler. It is missing the setup for the final part of stroke like RC4 has. Pricetag with Ti spring is tempting.

    Greets MPI!
    http://www.kiva.org - Loans That Change Lives

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    Don't want to hijack this thread. Forget I wrote anything.

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    I just opened and retuned my shim stacks on my DHXc. It can be done in less than 30 minutes the first time around and I did it in ten for a retuning. Made a huge difference, and with the low compression damping needs of the DW, it might be the ticket by just rearranging the shims a bit. Push has a sophisticated setup with the custom piston, but it appears the stock one will flow quite a bit (as I saw with my first tuning).

  5. #5
    holding back the darkness
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    Vivid Team Issue from PUSH.
    Good value, very tunable. Easy to use.
    <a href="https://www.flickr.com/photos/subliminalshiver/4952278527/" title="mojo by subliminalshiver1, on Flickr"><img src="https://farm5.static.flickr.com/4110/4952278527_ddd8918a63.jpg" width="500" height="375" alt="mojo" /></a>
    **** censorship

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    subliminalshiver how does the HD feel with the vivid on it. Have you been able to compare it to a RP23? I see you're running a lyrik DH, thats what I'm putting on mine as well. I'm thinking that a coil shock and a 170 fork will make it be a capable downhill bike. Coming off of a Mk1 nomad w/ a dhx-air that I never could get dialed in, I'm leaning towards a push mx tune for the HD.

  7. #7
    aka dan51
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    Quote Originally Posted by drinkwat
    subliminalshiver how does the HD feel with the vivid on it. Have you been able to compare it to a RP23? I see you're running a lyrik DH, thats what I'm putting on mine as well. I'm thinking that a coil shock and a 170 fork will make it be a capable downhill bike. Coming off of a Mk1 nomad w/ a dhx-air that I never could get dialed in, I'm leaning towards a push mx tune for the HD.
    Yeah, how do you like the Push vivid? I'm thinking about getting one, or the CCDB.

  8. #8
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    What spring weights are you guys running on the HD with coils?

    Anyone upgrade to a ti spring? Any comments on doing so with a 2011 RC4? I'm about 210 lbs with gear..
    Evil Insurgent/Purple Hope Hubs.Brakes.Pedals/35mm 12k LB Wheels

  9. #9
    www.derbyrims.com
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    Quote Originally Posted by bbarson
    What spring weights are you guys running on the HD with coils?

    Anyone upgrade to a ti spring? Any comments on doing so with a 2011 RC4? I'm about 210 lbs with gear..
    Here's a favorite coil spring calculator, and another basic calculator from TF Tuned...

    http://www.igorion.com/_coilspring/
    http://www.tftunedshox.com/info/spring_calculator.aspx

  10. #10
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    Just got an email response from Scot, he says they are running a 350lb spring on the RC4 on the HD.

    Do you guys who are running coils on the HD think I'll have a problem a 400lb titanium spring on an RC4 on the HD? To reiterate, I'm 210lbs with gear. Most of my riding is heavy XC/"freeride".
    Evil Insurgent/Purple Hope Hubs.Brakes.Pedals/35mm 12k LB Wheels

  11. #11
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    Quote Originally Posted by bbarson
    Just got an email response from Scot, he says they are running a 350lb spring on the RC4 on the HD.

    Do you guys who are running coils on the HD think I'll have a problem a 400lb titanium spring on an RC4 on the HD? To reiterate, I'm 210lbs with gear. Most of my riding is heavy XC/"freeride".
    Why the rush to jump straight to ti? Buy the shock with steel, a good LBS should let you swap springs for free until you find the rate that works. Then spend the money on the ti spring that you know works.

    Spring calculators are basically bike travel divided by shock stroke (average leverage rate) multiplied by rider weight. So for the mojo HD you'll have 160mm/63.5mm x 210 lbs = 529 lb spring rate. So whether you go with a 550 or 500 is up for grabs. Especially considering most actual spring rates vary by as much as 10%. I'd test it with both 550 and 500 steel springs and then buy a ti based on what you find.

    The spring calculators don't take a lot of factors into account. They typically get you within 50 lbs, but I've been burned before by them. I always dial things in with steel then buy a ti spring. Also, my experience has shown Diverse Suspension ti springs are a good value and typically pretty accurate on the spring rate.

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  12. #12
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    Agree with Bortis x1000000. You should never start out with a titanium spring. When you buy your shock, use a spring calculator to find a starting spring rate, then ask the shop you buy it from if they can loan you a steel spring with that rate, and springs+ and - 50 pounds from it.

    That spring calculator dirby posted (first one) would be really accurate if you could know the data to put in for the advanced settings (weight distro, bike weight and % of bike weight), as well as what kind of pre-load your bike will work best with, and unfortunately you can't know/measure any of that until you have the bike built up, which in that case you're better off going with the above method anyways.

  13. #13
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    Will do. The RC4 is shipping from Ibis with a 350lb steel spring, but I have a Manitou 400x2.75 ti spring I'm going to try as well. I'll let you know what I find (won't have it built up for at least a week)...
    Evil Insurgent/Purple Hope Hubs.Brakes.Pedals/35mm 12k LB Wheels

  14. #14
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    Quote Originally Posted by subliminalshiver
    Vivid Team Issue from PUSH.
    Good value, very tunable. Easy to use.
    <a href="https://www.flickr.com/photos/subliminalshiver/4952278527/" title="mojo by subliminalshiver1, on Flickr"><img src="https://farm5.static.flickr.com/4110/4952278527_ddd8918a63.jpg" width="500" height="375" alt="mojo" /></a>
    That is sick!

  15. #15
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    The HD uses a 2.5" stroke length shock. I wouldn't recommend testing out springs that are in sizes you're not going to be using. With your weight, and the riding you do I'm willing to bet you're going to want around a 450 coil with 1-2 turns of pre-load. At 210 pounds, 350 is going to be way too low for you, and 400 might be pushing it if you want a stiffer suspension for XC riding. For example, I weigh 175 geared up and I run a 400 ti spring for XC riding.

  16. #16
    Clyde
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    Quote Originally Posted by junktrunk
    I just opened and retuned my shim stacks on my DHXc. It can be done in less than 30 minutes the first time around and I did it in ten for a retuning. Made a huge difference, and with the low compression damping needs of the DW, it might be the ticket by just rearranging the shims a bit. Push has a sophisticated setup with the custom piston, but it appears the stock one will flow quite a bit (as I saw with my first tuning).
    Tell me more... Any retune pictures.. How is retune the shim stack and What you would want to do to tune it for you and your bike. What tools or parts needed to do the job.
    09 Ibis Mojo - All Mountain Moab Edition

  17. #17
    MPI
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    Hi!

    Can someone confirm me HD`s shock axle lenghts? Lower is M8x40mm but how about the upper one M8x?......... 21.8, 20.0 or 22.2?

    Greets!
    MPI
    http://www.kiva.org - Loans That Change Lives

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