Singletracks Mountain Bike News, Reviews, MTB Trails and Community › Protected: Forums › Mountain Bike Forum › Harsh high speed bumps
Tagged: compression, Giant Trance, rebound, suspension, suspension settings
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May 7, 2017 at 17:48 #214818
Hello
I am new to the forum and pretty new to mountain biking. I purchased a 2017 Giant Trance 2 and like it. I weigh 205 pounds. I am running 205 pounds of air in the reach shock with 3 clicks of rebound reduction. My front shock has 75 pounds of pressure. I have tried running from three clicks of rebound reduction to neutral.
Bumps like wash board roads or rough terrain with quick small high speed bumps about rattle my teeth out of my head. The bike is fine on larger bumps.
I have tubed tires and am riding on Knobby Nics. They say the least pressure is 32 psi I was running 25 but ended with a flat. I am now running 32.
Is there anything I can do to soften these high speed small bumps and smooth the ride out?
Thank you for your help
and input.
Franklin
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May 7, 2017 at 18:24 #214819
It’s hard to say not being present, but one thing to consider is how much of your shock travel you are using. If it is very little, then you likely have too much air pressure in the shocks.
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May 7, 2017 at 18:26 #214820
Also how much of the rear shock travel are you allowing for sag? Most riders allow for about 25-30%. If you don’t understand sag, then just do a search online.
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May 12, 2017 at 22:39 #215522
Mongwolf
i am running 30 plus of sag on the rear shock and still running about 220 pounds of pressure. That would include my 205 pounds and a ten pound backpack. On a moderate trail with bumps I use about 70plus percent of the travel. Would be less if I got of the seat more.
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May 7, 2017 at 18:29 #214821
Hi Mongwolf
i have about 25-30% sag front and back.
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May 7, 2017 at 19:40 #214822
If the fork is brand new, it may take a few more rides to properly break in. Then you may notice it becomes more supple. Find a familiar trail with some washboard and play with the rebound setting. If you make small changes and ride the same section of trail you should be able to get er dialed. Also, you could try setting your sag to about 20% and see if it helps. Seems counter intuitive but it can make a difference.
Cheers !!
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May 8, 2017 at 05:51 #214826
Thank you Bill, I will give it a try. I have had the bike about two months and have put about 150 miles on the bike. Both shocks are also left in the open position.
Franklin
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May 8, 2017 at 10:25 #214855
On my Giant I run 20% sag front and 30% rear.. That seems to be about the best for me. But until you have a high end fork or shock level with separate high speed and low speed adjustments there is not a lot you can do.
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May 12, 2017 at 22:32 #215518
Thank you Alvin
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May 8, 2017 at 14:10 #214926
Maybe for your conditions you just need to run a little lower air pressure than normal in your shocks. It can’t hurt to keep trying different pressures.
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May 12, 2017 at 22:34 #215519
Hi Mongwolf
i have tried from 55 to 110. No real change in the high speed bumps.
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May 8, 2017 at 14:11 #214928
Also, you didn’t comment about how much travel you are blowing through on a typical ride. So are you checking this?
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May 12, 2017 at 22:36 #215520
Mongwolfi
At 55 pounds I used 5 inches of the 5.9 on a moderate trail. Sag appears to still only be 25% or so. I weigh 205.
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May 9, 2017 at 07:49 #214954
I’d argue you’ll get little change with suspension set up when it comes to high frequency small bumps at speed such as washboard or the like.
The best suspension in the world simply doesn’t have time to react to this stuff when your speed is higher.
The only thing you can do, imo, is use wider rims with tubeless tires and run less pressure.
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May 12, 2017 at 22:44 #215523
Thank you Zoso
i was using 25 pounds in the tires though tire recommended no less than 32. After a blowout I now run 30.
I think part of what you said I will do next, tubeless tires and much lower pressure. A buddy, only weighs 175, is running 20 pounds. He rides a Trek Fuel Carbon (without a doubt the nicest bike I have ridden). His is a Cadillac on the high frequency bumps.
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