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 Anyone tested Hyperpro fork springs

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BelgardaBuddy




PostSubject: Anyone tested Hyperpro fork springs   Wed Jul 11, 2018 4:21 am

Hi.
II am new to this forum and I just got a seconhand WRR with tuned suspension from a specialist, what a sweet ride! However I need harder fork springs as It bottoms out to easily on jumps. I am wondering if anyone has tried hyperpro progressive forksprings and if so, how do they compare to stock? I would really appreciate any advice.
Cheers
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rsteiger

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PostSubject: Re: Anyone tested Hyperpro fork springs   Wed Jul 11, 2018 9:53 am

BelgardaBuddy wrote:
Hi.
II am new to this forum and I just got a seconhand WRR with tuned suspension from a specialist, what a sweet ride! However I need harder fork springs as It bottoms out to easily on jumps. I am wondering if anyone has tried hyperpro progressive forksprings and if so, how do they compare to stock? I would really appreciate any advice.
Cheers

I have not tried the Hyperpro front springs but I have always wondered about the use of progressive springs in a fork that is tuned for a linear rate spring. Do you know if the specialist set up the fork with a progressive or linear rate spring?

The other thing I have seen is that when making a significant change in your spring rate that at times you need to go back and change the valving in the fork to allow it to properly damp the new spring. For instance if you had forks set up for a 130lb rider with a low spring rate and then put new spring that were sized for a 250lb you would not have enough damping in the circuit to properly tune the suspension.

If you haven't done this type of work before and like how the bike currently handles then I probably would opt to take it back to the specialist and have them redo the front end. Another option if you are close to the weight of the previous rider is to play with the air gap in the forks to artificially create a progressive spring rate as the forks compress.
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johnkol




PostSubject: Re: Anyone tested Hyperpro fork springs   Wed Jul 11, 2018 3:10 pm

BelgardaBuddy wrote:
However I need harder fork springs as It bottoms out to easily on jumps.

The correct fork spring rate should be determined by the amount of sag, not by whether you are bottoming out on jumps. Have you measured the sag to determine whether the spring rate is too soft?

To prevent bottoming, have you tried increasing compression damping, or increase oil level in the forks?
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BelgardaBuddy




PostSubject: Re: Anyone tested Hyperpro fork springs   Wed Jul 11, 2018 3:27 pm

Thank you very much for your input rsteiger.The difference in weight between me and the ex owner is about 10 kg. The fork and shock springs are stock and the suspention works very good together. Shock has no kick back and enough re ound and it is good damped. The front is set up for a rider of about 75 kg and I am about 85 kg with out hear. The previous owner said that his weight was on the limit for the front fork. Since I would like to have a bit less sag and more compression towards the end. The company who did the tuning is 2500 km roundtrip away, but thanks to your advice, I will touche with them to see If they have some data of what has been done.
I called Hyperpro (great service) and they informed that sag is about 15 mm more with their springs but is more progressive towards the end. Since I do not want more sag I guess I should try to go with linear springs from Race tech. Maybe a 0.5 instead of the stock 0.46. I hope that change in spring rate will be good but I am just guessing..
Does anyone know how much of a difference going from a 0.46 to 0.5 springrate will have?
Thanks again.
Cheers
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BelgardaBuddy




PostSubject: Re: Anyone tested Hyperpro fork springs   Wed Jul 11, 2018 3:43 pm

I am an amature so I really appreciatexthe advice. I have maxed out the compression but I have not meassured sag yet! It just felet like I needed less, ha ha, sily me. I will try to putt some more fork oil in and play with the height.
Does anyone know how much oil can be added?
Cheers
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rsteiger

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PostSubject: Re: Anyone tested Hyperpro fork springs   Wed Jul 11, 2018 4:53 pm

BelgardaBuddy wrote:
 I am an amature so I really appreciatexthe advice. I have maxed out the compression but I have not meassured sag yet! It just felet like I needed less, ha ha, sily me. I will try to putt some more fork oil in and play with the height.
Does anyone know how much oil can be added?
Cheers

You probably should get a service manual since the oil level is measured from the top of the tube without the spring in a compressed state if I remember. I think the recommended distance is 105mm (http://wr250rforum.forumotion.com/t7827-fork-oil-level-question).

But Johnkol is right. You really need to see where you are at with the sag on the suspension first (http://wr250r.com/articles/suspension-adjustment-guide). You can adjust the preload to move the rear sag but the front does not have a preload adjsutment so at that point if you find that you have too much sag in front you can play with the air gap or you may need new springs.

Measure first then adjust.
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rsteiger

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PostSubject: Re: Anyone tested Hyperpro fork springs   Wed Jul 11, 2018 4:55 pm

BelgardaBuddy wrote:
Thank you very much for your input rsteiger.The difference in weight between me and the ex owner is about 10 kg. The fork and shock springs are stock and the suspention works very good together.  Shock has no kick back and enough re ound and it is good damped. The front is set up for a rider of about 75 kg and I am about 85 kg with out hear. The previous owner said that his weight was on the limit for the front fork. Since I would like to have a bit less sag and more compression towards the end. The company who did the tuning is 2500 km roundtrip away, but thanks to your advice, I will touche with them to see If they have some data of what has been done.
I called Hyperpro (great service) and they informed that sag is about 15 mm more with their springs but is more progressive towards the end. Since I do not want more sag I guess I should try to go with linear springs from Race tech. Maybe a 0.5 instead of the stock 0.46. I hope that change in spring rate will be good but I am just guessing..
Does anyone know how much of a difference going from a 0.46 to 0.5 springrate will have?
Thanks again.
Cheers

Racetech has a spring calculator on their website where they will estimate the spring rate that you need.  In my experience they have been a bit high in the past but it looks like they have made some adjustments recently. I put your weight in the calculator and it showed that the stock rate should be about right for you.

When you talk to the shop that did the original set up ask them if they can recommend a spring rate as well.
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johnkol




PostSubject: Re: Anyone tested Hyperpro fork springs   Wed Jul 11, 2018 5:31 pm

BelgardaBuddy wrote:
Does anyone know how much oil can be added?

I have seen people using a low value of 90mm, but I suggest you work in small increments of 10mm.

Since you don't know what oil weight is in the forks now, it may be a good idea to replace the fork oil completely so you work from a known baseline. Don't forget to measure the level of the current oil before you empty it out.
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BelgardaBuddy




PostSubject: Re: Anyone tested Hyperpro fork springs   Fri Jul 13, 2018 3:51 am

Hi.
Thanks for all the great advice!
I will start by meassuring sag and change to new fork oil and play with oil height. I will post about the observed difference when I get back home from a. Mtb holliday in an park (Åre, Sweden)..
Cheers
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