Rear shock on trackbike - Chicagoland Sportbikes
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post #1 of 7 (permalink) Old 04-24-2006, 11:53 AM Thread Starter
 
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Rear shock on trackbike

Now that I've gotten more into track riding...I'm trying to learn what's what. I have noticed ads for bikes that will say "Penske double", or sometimes it's a 'triple'. What exactly is the difference between them? Is there a web page that better describes how one is more effective over another? I do see that they are fairly pricey though.
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post #2 of 7 (permalink) Old 04-24-2006, 01:56 PM
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Double adjustment vs. Triple Adjustment

http://www.hardracing.com/Shocks%20&...amp/Penske.htm

That is better info than the Penske site. I'd suggest calling 4&6 for a good overview. NESBA is also Penske sponsored, so you can check through them as well.

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post #3 of 7 (permalink) Old 04-24-2006, 02:13 PM
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On a fully adjustable shock there are three or four adjustments.

Compression : Which is how fast or slow (The rate) the shock compresses. My Ohlins shock has 25 clicks on it. Way more than I care to mess with.

Rebound : Which is how fast or slow (The Rate) the shock comes back to it's neutral point. how fast it springs back.

Preload : Almost all shocks have a preload adjustment. Even the cheep stock SV shock has a preload ajustment. This is the jam nut on top of the spring that is used to load the spring to achieve a proper sag #.

There is also a 4th adjustment on a good shock for ride height. There is a clevis on the bottom of the shock that can shorten or extend the shock length which is very important

If you take the spring off of a shock and play with the compression and rebound it is quite noticable how it works. Pretty fun to see in slow motion on the bench.

All these ajustments are pretty fancy. If you have a shock with the correct spring rate for you and the correct sag #'s along with the ideal ride height setting that will do enough for the average track day or club level racer. You do not need to spend 1000 dollars on a shock to go fast.

Ryan Hall raced and won a few regional and a national championship on his SV650 with a rebuilt GSXR SRAD shock set up for his weight.

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Last edited by Grasshopper; 04-24-2006 at 02:20 PM.
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post #4 of 7 (permalink) Old 04-24-2006, 02:40 PM
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Quote:
Originally Posted by Grasshopper

Ryan Hall raced and won a few regional and a national championship on his SV650 with a rebuilt GSXR SRAD shock set up for his weight.
Argh, that just makes me feel REALLY slow! Of course, it helps that Ryan is damn near a stick like Nick here. My Penske is probably WAY more than I need, but someday I'll grow up to be fast enough to use it.

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post #5 of 7 (permalink) Old 04-24-2006, 02:45 PM
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Quote:
Originally Posted by Grover
Argh, that just makes me feel REALLY slow! Of course, it helps that Ryan is damn near a stick like Nick here. My Penske is probably WAY more than I need, but someday I'll grow up to be fast enough to use it.
Jason Damico built it.

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post #6 of 7 (permalink) Old 04-24-2006, 09:55 PM
 
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"Tripple" adjustable usually means:
1. Low Speed Compression (The normal compression setting.)
2. Rebound
3. High Speed Compression

"Double" usually means #3 is missing.
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post #7 of 7 (permalink) Old 04-24-2006, 10:21 PM
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Quote:
Originally Posted by bozjidar
"Tripple" adjustable usually means:
1. Low Speed Compression (The normal compression setting.)
2. Rebound
3. High Speed Compression

"Double" usually means #3 is missing.
Nope. The low speed compression is not adjustable on a "Double".

An excerpt from "Which aftermarket shock is right for me?"
By Max McAllister
President of Traxxion Dynamics, Inc.

"When comparing the 8981 and the 8987 the difference is in the reservoirs, where compression damping adjustment takes place. The compression adjuster on the 8981 is a high speed compression adjuster. High speed refers to the velocity of the wheel moving up and down, not how fast the bike is moving around the track. To clarify, low speed compression is "firmness" or "feel". High speed compression is "bumps"."

http://www.traxxion.com/products.sho...ftermarket.asp

Chris
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'06 GSXR 600 / '05 CRF250X / '04 CRF 230 / '05 CRF 88
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