Sonic Front and Hyperpro Rear Springs - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 13 Old 10-18-2008, 05:10 PM Thread Starter
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Sonic Front and Hyperpro Rear Springs

I have recently installed some new suspension upgrades. I was not happy with the OEM front diving too much under heavy braking, even with full preload dialed in. I was also unimpressed with the OEM rear shock being too soft, even with full preload dialed. This was especially true when riding 2-up. I weigh 240lbs, and my wife about 135lbs. We also ride with Givi hard luggage on some trips.

The purpose of this post is not to instruct others on installing these upgrades, but rather to supply a few interesting pictures and supply a bit of information for those interested.

Front: Sonic 1.0 kg/mm Springs, sourced from http://www.sonicsprings.com/catalog/
I paid $79.95 + shipping.

Going with the Sonic springs was a relatively easy decision, since so many forum members here seem happy with their performance. I was pleased with the price and Sonic's online spring rate calculator. Depending on my riding style, it suggested either 0.95 kg/mm or 1.0 kg/mm, so I went with the heavier rate. I am using a 50/50 mix of 10W and 15W for oil, yielding a 12.5W oil. So far I have done a few short trips with the wife on board at 2 lines of preload showing, and the front end does not dive like the OEM did on full preload. I am very pleased.

Picture 1- At the top of the picture is the OEM spacer tube and OEM progressively wound spring. At the bottom is Sonic's plastic spacer and 1.0 kg/mm constant rate spring. I cut the plastic spacer to the installation instruction's suggested 4.25" and this resulted in the desired 0.5" of spring preload when the preload adjuster on the fork's top cap is dialed in to half the available preload;


Picture 2- Plastic spacer cut to suggested 4.25";



Rear: Hyperpro Progressive Spring, sourced from
http://www.hyperprousa.com/
I paid $119.95 + shipping.

Deciding what to go with on the rear suspension took a little more research. After seeing a picture of Stromboli's jig (Thank-you Stromboli!) for changing out the rear spring on the OEM shock, I knew that I wanted to replace the spring, and not the entire shock, especially since my shock is still almost new. From what I gather, Wilber's makes replacement springs, but availability has potentially become an issue here in the United States. I decided to try Hyperpro, since it was a progressive spring and it was relatively cheap and readily available.

Other than the purple color of the spring (I had to paint it black) I have been pleased with the Hyperpro's performance. It feels about the same as the OEM spring for the first third of its travel. However, it is indeed "progressive", as it gets firmer as more weight/load is applied. I no longer have to dial in full preload, and I can use the preload adjuster for its intended purpose. As you can see in the picture, the Hyperpro is "beefier-looking" than the OEM. The OEM spring weighs 3.3 lbs, while the Hyperpro weighs 3.9 lbs.

Picture 3- OEM shock and spring in "Stromboli" compression jig;


Picture 4- Compressing the OEM spring to expose the retaining ring. This ring needs to be removed to allow shock disassembly;


Picture 5- A close-up of the removed retaining spring;


Picture 6- The OEM shock and spring (silver) and preload aduster next to the Hyperpro spring (black);


Picture 7- A close-up of the preload adjuster in the "fully-in" position;


Picture 8- The new Hyperpro spring installed in the OEM shock housing;

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post #2 of 13 Old 10-18-2008, 05:37 PM
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Love your spring compressor. I see you used the KISS method. "Keep It Simple Stupid"

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post #3 of 13 Old 10-18-2008, 08:33 PM
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nice write up, great photos.. and I love your garage floor :bom_builder2:

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post #4 of 13 Old 11-09-2009, 03:52 PM
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My kind of DIY'er. Spotless.

As my kid gets bigger, my spring gets smaller. I'll be doing this in the next few months. Good one to bookmark.

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post #5 of 13 Old 11-09-2009, 07:47 PM
 
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How did you get that ring off with the 'Stromboli' so close to the shaft - there appears to be no room to finagle. Details please!
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post #6 of 13 Old 11-09-2009, 09:26 PM Thread Starter
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Quote:
Originally Posted by Brian Patterson View Post
How did you get that ring off with the 'Stromboli' so close to the shaft - there appears to be no room to finagle. Details please!
The picture doesn't show it, but you only need clearance measuring the width of the ring on each side.

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post #7 of 13 Old 11-10-2009, 11:02 PM
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Excellent info! Thanks!

I believe my Vee is getting a new shock spring ASAP. Of course, I'd like the full Sasquatch rebuild, but $130 vs. $450... yeah.

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post #8 of 13 Old 11-11-2009, 02:23 PM
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Just an update -- I ordered a Hyperpro spring this morning and they are currently out of stock on the DL1000 springs.

However, I talked to Sam, and he says it'll only be about a week. Can't complain too much about that. :mrgreen:

He also mentioned that he had five in stock last week -- 'tis the season to monkey with your V-Strom's suspension, I guess.

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post #9 of 13 Old 11-11-2009, 02:39 PM
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Quote:
Originally Posted by Brian Patterson View Post
How did you get that ring off with the 'Stromboli' so close to the shaft - there appears to be no room to finagle. Details please!
It looks like you spread the ring till it clears the gap, then move it up and off. It took me a few minutes to figure it out too.

Go hakafugu yourself.
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post #10 of 13 Old 01-27-2019, 07:54 AM
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can someone tell me what size allen wrench is used to take the set screw out on the preload collar? only post i can find says .5mm, that cant be right, and i want to have everything ready before taking out the shock, thanks, Pepe

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