Dragshock™ / Dragshock EZ™ Suspension Demonstration

Brock's Performance president, Brock Davidson, an avid performance enthusiast and past national championship winning rider as well as tuner, explains how to adjust the rear suspension on his BMW S1000RR 'Christine' for drag race use. Follow along as he explains how the rebound dampening functions as it relates to the launch and down track acceleration between himself and his lighter 'jockeys'.

Note: At 9/16th sag using a 95 Newton (542 lb.) spring with a 150 lb. rider in the saddle, a rear tire pressure of 12 psi is used. Brock's weight of around 210 lbs. suited brings the sag to 1" and a tire pressure of 18 psi is used. The bike squats a bit more than optimum, which means the spring preload should be increased a bit, or the spring rate might need to be increased -- BUT, the object is for this bike to be as fast as possible with the smaller riders--not tuned for him--so only tire pressure adjustments are made.

Slick track = more rebound dampening added, more squat for more traction. Less tire pressure, if possible.

Sticky Track = more spring preload, less squat, more tire pressure... although light riders tend to spin, so lower pressure is generally used. (see Jeremy's run at beginning of video, it is very close to perfect.)

Bumpy Track = If the racing surface is exceptionally bumpy, the rebound dampening must be reduced (example adjust from -15 clicks to -20 clicks) to prevent high speed 'oscillation'.

Stock or Short Wheelbase Applications = Stock/Short wheelbase bikes do not require as much 'squat', because they are not as prone to spinning. Since more squat leads to additional traction, this can also cause stock wheelbase bikes to wheelie. As a result, we would have a bit more static spring pressure dialed in, with more compression dampening and less rebound dampening (to force the front end back down as the rear rises).

Also note: This advice applies to all makes and models. The BMW S1000RR shown was simply used as a handy example for this particular video. Spring rates will differ between makes/models.

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Please watch: "2017 GSX-R1K S2B: Episode 4 - Exhaust Installation and Theory (Part 3): Full Exhaust Systems"
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[blessedvetoutdoors]

This video is Eight years old and still holds weight as if it were gold. Thank you so much sir for sharing this information!!! I surfed Psychobike back in 2006 on and off over the years. I'm truly glad you're still doing well sir and are blessed! Much love and thank you for everything you've done for the drag/street bike community over the years.

[martins]

This is probably the clearest explanation on what rebound does.
Another great video.

[BrockDavidson]

Stock wheelbase bikes do not require as much 'squat', because they are not as prone to spinning. Since more squat leads to additional traction, this can also cause stock wheelbase bikes to wheelie. As a result, we would have a bit more static spring pressure dialed in, with more compression dampening and less rebound dampening (to force the front end back down).

[addictedcorn]

Great teaching video! I've studied this video many times and reference it to many other racers when it comes to tuning. Thank you Brock

[pumpkinhead]

👍 vid Brock immediately shows. In direct explanation at to what I personally am doing wrong and what others may or may not be doing right. Also gives clear view there's more to rider feel than sitting the bike.

[amazingmusti]

I had never seen how the shock absorber rebound dampening function before. I was the 501st one to like the video. lol
Thank you very much for all your videos.

[BrockDavidson]

Very similar. The rebound dampening is almost identical and any adjustment shown in this video can be duplicated. We have a high speed compression dampening which works well 90% of the applications we encounter. It is an excellent alternative for the cost conscious purchaser.

[BrockDavidson]

Keep watching our site. We are working on a Dragshock EZ version for the BMW also.

[anthonychisolm]

Great information Sir and I'm definitely subscribed to your channel and I'm definitely adding this to my likes list. Great job Mr. Brock and keep up the good work 👍👍

[jefferyboring]

I follow his instructions on the bandit ohlins with my turbo it felt like a 6” extension it helped willies so much it’s a huge difference. Buy the shock before u do the extensions !!! Especially if u wanna keep it streetable

[punksrfr]

Great video Brock, I had to revisit this one again. Thank you for sharing!

[BrockDavidson]

Erick, The stock shocks don't have the adjustment capabilities that the Dragshock does, so you wouldn't be able to have this set up without the Dragshock.

[jediknight]

The BEST thing you can do is get your suspension setup by someone who knows what they are doing it will improve your riding so much drag or road ride or racetrack lap

[nomellocreampig]

My friend has a poster of this bike on his shed's wall, I see it every time I get hammered.

[peterherrington]

What an excellent video, well explained in simple terms.
I'm currently looking for a top quality rear drag shock for my 66 inch supercharged busa.
That ohlins looks excellent. Can you give me a price for a brocks ohlins delivered to England please ?
I will look into it further.
Thanks again, add 1 sub from England.

[jeffcraig]

Jeremy teasley is the man. need more credit here D.M.E. chose him to substitute the loss of Joey. but long before that, he has prove, he is above most!!!

[looker]

How do you clear the Error !DDC off the screen of 2016 BMW s1000rr? Once you disconnect the stock shock it shows

Error !DDC on display screen.

[scrappy]

Hey I've got a fully built 2000 zx9r. I'm have problems on the 8th track. I've got a 6in stretch and the front in has 30 weight race oil so it doest move and it sit about 4 inches off the ground.When I launch off the tree it makes it about 50-60 foot and goes strait up in the air. Can u tell me how to keep it down.

[iwant]

What are the typical gains in the quarter mile if you bike was set up perfect with the stock shock verses perfect with the drag shock?

[poolman]

Hey brock good stuff, I have a 03 gixxer, lowered and stretched, street/dragbike, the stock shocks rebound comes up to fast after fully adjusted, is there any other shock that I can use to fix this, don't have a big budget for a expensive drag shock at the moment?