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post #1 of 10 (permalink) Old 08-26-2015, 12:42 PM Thread Starter
Grand Prix 125
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Hyperpro Progressive Spring

Hi,

Has anyone used the Hyperpro progressive springs, either forks or rear shock ?. I have heard good things when used in other bikes, for £1oo ish each end they are probably a bit cheaper than ktech or similar.

I can't go to the cost of an aftermarket shock or having the forks revalved but a set of springs each end I can do, if they are any use.

thanks
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post #2 of 10 (permalink) Old 08-26-2015, 05:05 PM
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It's my understanding that you'll be better off with a proper straight rate spring than with a progressive, but there's nothing wrong with Hyperco. Springs will be an improvement unless you're right at 170 pounds/12 stone or so.

It would help us help you if you listed relevant bikes in your user profile. I can't remember what you ride and I assume you're not asking about the D'ohville.

I think all, definitely most, Sprints came with shocks that require special tools for spring changes.

Cheers,
-Kit
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post #3 of 10 (permalink) Old 08-27-2015, 04:14 AM Thread Starter
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Hi kit,
Sorry my bike is a sprint st 955 2003. O weigh 80kg in gym gear so probably 90kg ish in full bike gear. I use the bike everyday for commuting and for fun scratching around at the weekends. I would like to get a more planted feel. With other bikes of comparable age you get that nice settled feeling as soon as you hop on the bike. I know springs won't help the damping but curious about people's experience.

I have adjusted sag correctly which did help.

I will update my profile as soon as I work out how to do it on the phone.

Thanks for your help.
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post #4 of 10 (permalink) Old 08-27-2015, 11:11 AM
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HH, the front isn't really all that bad for your weight, but the seals get rather sticky. As in, "stiction'. The spring rate is about right, but the stiction may make sag determination a drag (pun intended).

The common 'cheap fix' for the front is to drain and clean the tubes, then replace the fork oil with a slightly higher viscosity (numbers are different, depending which side of the pond you are), and installing new seals. Check the bushings for wear while you've got the legs disassembled.

The dust caps are probably fine; you'll want to use NOK seals (which are OEM fitted).

A quick way to 'test' for the stiction is to spray a bit of lubricant on the sliders just above the dust caps, jounce the front a couple times, then take the bike out for a quick spin. If the front feels 'smoother' you might have an easy fix in front of you.

Now, the rear shock wasn't great when it was new, and yours is 12 years old. The Showa unit is rebuildable, probably for a lot less money than an aftermarket unit will cost. There are several threads on that subject.

'Tmod' is our forum suspension guru; search for his threads.

One last tip: Disassemble, clean and lubricate the fork stem bearings while you're at it.

Oh, and be very careful with the speedometer pickup when you put the front wheel back on. It is easy to mess that up, and ruin the pickup.
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post #5 of 10 (permalink) Old 08-28-2015, 03:04 PM
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I fitted the Hyperpro Progressive Springs in the forks of my 08 Sprint after buying them on ebay very cheap. For the price, £30, I thought it was worth a shot. Along with the springs you get spacers and recommended oil type and level.

These differed from stock. I can't remember exactly what they were at the moment. I will have to look it up.

Anyway there is a definite improvement, not so much dive on initial brake application and a little firmer through the range without being harsh. I am not an aggressive rider and prefer the smooth but progressive approach. The rear is still stock.

I guess it depends on how you ride as to how much benefit you might get from the various improvements suggested.
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post #6 of 10 (permalink) Old 08-30-2015, 05:53 PM Thread Starter
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Hi, Thanks for the feedback, looking at the options the springs and oil make sense. I haven't got the time or interest to try the usd fork swap. I can still have peg scraping fun on the old.girl I would just like a little more of a planted feel. Plus the bike is really my winter hack for work so I have to remember that before I start throwing too much money at it ;-p. Apart from maybe anew exhaust, then a respray oh and a seat cowl, then the rear shock probably needs swapping....Oh no it is starting again.
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post #7 of 10 (permalink) Old 10-22-2019, 09:34 PM
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Quote:
Originally Posted by HondaHunter View Post
Hi, Thanks for the feedback, looking at the options the springs and oil make sense. I haven't got the time or interest to try the usd fork swap. I can still have peg scraping fun on the old.girl I would just like a little more of a planted feel. Plus the bike is really my winter hack for work so I have to remember that before I start throwing too much money at it ;-p. Apart from maybe anew exhaust, then a respray oh and a seat cowl, then the rear shock probably needs swapping....Oh no it is starting again.
There's always something isn't there. I have the same bike and about to do the front forks.
Tell me, how was your experience with the fork work you would have completed by now I guess.

mine are weeping from the left fork, right where the chrome tube slides into the shocker housing. I'm pondering the same question, to just fit new seals after all this time and clean and upgrade the oil.... or to put progressive on my daily commute.
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post #8 of 10 (permalink) Old 10-25-2019, 11:03 AM
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I was pursuing the Hyperpro when the same remarks about progressive springs steered me to Racetech. To heavily condense the matter, progressive springs are good at only one set of parameters (compression/rebound, etc...). The same settings work across the board for a linear spring. In the end the Racetech springs completely transformed my '08. I didn't revalve them but chose to simple up the viscosity of the fluid to help with damping.
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post #9 of 10 (permalink) Old 10-26-2019, 10:11 AM
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Quote:
Originally Posted by armarra View Post
There's always something isn't there. I have the same bike and about to do the front forks.
Tell me, how was your experience with the fork work you would have completed by now I guess.

mine are weeping from the left fork, right where the chrome tube slides into the shocker housing. I'm pondering the same question, to just fit new seals after all this time and clean and upgrade the oil.... or to put progressive on my daily commute.
As noted in one of the earlier posts, contact Tmod on this forum. Terry is a real pro and won't steer you wrong (pun intended).
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post #10 of 10 (permalink) Old 10-27-2019, 09:09 AM
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I was seriously thinking of installing a Hyperpro progressive spring on my 06 ST after putting one on my 2016 GSX 1000F. It transformed the rear end. Much better over the small jarring bumps and still packs down in the corners nicely. Best improvement for the bucks that I did on the suspension.
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