Fork Springs upgrade

[Jbay]

from what I hear spring upgrades are worthwhile

stock Tiger are rated 0.60 or 0.70? the RaceTech site lists about a 1.0 for my weight

another brand is HyperPro USA, but they do not rate the springs for the weight of the rider

"The more force you put on a HYPERPRO spring, the greater the resistance. This means a HYPERPRO spring will automatically adjust if you put a passenger on your bike. It will also automatically adjust to your weight. If you weigh 50 kg or 150 kg, a HYPERPRO spring gives you a perfect setup right out of the box. HYPERPRO springs even respond to changes in the amount of fuel in your tank!"


:ponder: (to good to be true?)

so has anyone here used HyperPro?

http://hyperprousa.com/images/springcurveWeb.jpg

http://hyperprousa.com/catalog.php?cat=Springs

[ed29]

Science and physics say the claims should be taken with a grain or two of salt. the chart shows that the Hyperpro is a progressive spring, which is why it does not have a compression weight rating like the stock or race Tech. The progressive starts out softer and gets firmer as it compresses. Brake dive is typically worse with a progressive than a straight rate. Compliance of the ride is usually more cushy, but the trade off is less stability in tight corners, or over ripples.

What is your performance or handling goal that you want to improve?

[Manfred]

ed29 - my experience on two bikes with progressive springs on both ends is contrary to your description. The soft compression takes place early in a turn, providing a very stable track through a turn - even through bumps and ripples. I can take curvy turns much faster on progressives than on constant rate springs, which were stock, even with proper air & oil adjustments.

[ed29]

Different styles of riding on different machines... different results. Oh well, not surprising.

[Jbay]

Ed you always ask a question to answer a question :mrgreen:

mostly light touring and twisties, mostly pavement (slow on back roads and gravel), on aggresive street curve riding you can feel the suspension wallow, its a tall bike too, also brake dive is noticable

have a fork seal leak and want to replace (cheap) stock springs for a 200lb plus rider, maybe Racetech and a 0.95 or 1.0 rated spring

[ed29]

I think the .95 might be a good fit, the difference between that and a 1.0 would be tough to discern from the seat and bars. If compression and rebound are both adjustable those setting should be tweaked to match well with the spring rate change.

Of course my information is free, and worth little more on some days. ;-) If the calculator on the Race Tech site points to the 1.0 given the data you entered then that would be the ticket. Brake dive should be noticeably improved with a stiffer straight rate spring.

[houndawg]

jbay,why not call works performance a call and talk to tech they offer stacked springs.

[DFW_Warrior]

I'm not a big fan of progressively wound springs. For me the wallow way too much, and I feel way more planted with straight rate springs.

There's a reason that racers use straight rate springs and not progressives.

[Fittysom'n]

I replaced the springs on my R1150R with "Purple perfection" Hyperpro springs. Though better than my OEM springs with over 20,000 miles.... I've since learned that a good shock absorber is comprised of parts correctly married to each other. In short, I will never arbitrarily add an after-thought spring to my current pogos again.....

I had the suspension of my FZ1 addressed for my short inseam (I'm 5' 2"). I asked that the internals be lowered an inch, and the springs replaced. Based on what the guys-who-know... know, I asked for single-rate springs rather than progressive springs. The bike bottomed out and drug hard parts with the stock suspension max'ed out for my 220+lb's. With everything LOWERED and inch, and the OEM springs replaced with the CORRECT rate springs for my weight, and revalved for the mods..... the ONLY time I ever touched down again was on a high speed sweeper at 110 mph with 2CT's (WooHOO!).

I just got an email from Dale Walker of Holeshot (Bandit Guru in CA), he said he's working on a new rear shock for the 1250S. If you're gonna do anything with the suspension, don't try to save money, do it right.

[Boxercup Dave]

I used the Racetech spings in my Triumph and Jerry (lobos10) used them in his. I was going to use progressive springs but it was suggested by a suspension expert to go the other route.

Using the Racetech springs was a huge improvement and highly recommended. It rides smooth without being too stiff and greatly reduced fork dive which helps with cornering stability because steering angle change is reduced when braking hard before a corner.