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-   -   A few thoughts about progressive fork springs... ( https://www.xt660.com/showthread.php?t=19823)

lankyrider 04-12-15 17:49

Once loaded up it sounds like the progressive fork won't be much use to me. Would mixing and matching make sense - Ohlins forks and a hyper pro shock spring at the back?

Pleiades 05-12-15 21:21

Quote:

Originally Posted by lankyrider (Post 216488)
Once loaded up it sounds like the progressive fork won't be much use to me. Would mixing and matching make sense - Ohlins forks and a hyper pro shock spring at the back?

It is fine to mix and match. As I mention early in this thread, I�ve tried both linear and progressive springs back to back at the front and rear and came to the conclusion that linear front (Ohlins) and progressive rear (Yacugar/Hyperpro) was the way forward for me at 85Kg in full kit.

As you suggest, progressive front springs tend to get �light� and a bit slow to react to bumps and corrugations when there is a lot of weight (luggage, pillion etc.) towards the back of the bike. Theoretically, the main advantage of a progressive rate spring is that as load increases the spring effectively stiffens saving a lot of fiddling about adjusting preload to suit a range of conditions. Now this works fine on the rear as additional load/weight acts downwards (the way you�d expect it to) on the spring/shock and the progressive stiffening works in your favour. However on the front it works in reverse; the more you load up the bike, the more you tip the weight distribution rearward, the lighter the spring rate gets so you end up riding in the softest part of the forks stroke and with SAE15 oil (typical of progressive installations) in the forks this means they become over damped and sluggish to react.

Everybody has their own take on how they want their bike to handle and have very different needs in terms of luggage carrying, pillions and road/trail conditions, so the best piece of advice I can give is experiment. You won�t know what you like or works for you until you�ve tried out several permutations� which unfortunately can get expensive! ;)

lankyrider 06-12-15 16:49

Thanks for the help, it's all very. For now I think I'll take the current setup off road, see how much I hate it, and then set funds aside accordingly. That means I'll have to buy a bashplate first - I wonder when this list of wants ends..

Richlybow 12-12-15 10:37

Quote:

Originally Posted by lankyrider (Post 216536)
Thanks for the help, it's all very. For now I think I'll take the current setup off road, see how much I hate it, and then set funds aside accordingly. That means I'll have to buy a bashplate first - I wonder when this list of wants ends..

Haha.....NEEVVVVEEERRRRRR
Quote:

Originally Posted by Pleiades (Post 216517)
It is fine to mix and match. As I mention early in this thread, I�ve tried both linear and progressive springs back to back at the front and rear and came to the conclusion that linear front (Ohlins) and progressive rear (Yacugar/Hyperpro) was the way forward for me at 85Kg in full kit.

As you suggest, progressive front springs tend to get �light� and a bit slow to react to bumps and corrugations when there is a lot of weight (luggage, pillion etc.) towards the back of the bike. Theoretically, the main advantage of a progressive rate spring is that as load increases the spring effectively stiffens saving a lot of fiddling about adjusting preload to suit a range of conditions. Now this works fine on the rear as additional load/weight acts downwards (the way you�d expect it to) on the spring/shock and the progressive stiffening works in your favour. However on the front it works in reverse; the more you load up the bike, the more you tip the weight distribution rearward, the lighter the spring rate gets so you end up riding in the softest part of the forks stroke and with SAE15 oil (typical of progressive installations) in the forks this means they become over damped and sluggish to react.

Everybody has their own take on how they want their bike to handle and have very different needs in terms of luggage carrying, pillions and road/trail conditions, so the best piece of advice I can give is experiment. You won�t know what you like or works for you until you�ve tried out several permutations� which unfortunately can get expensive! ;)


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cam147 17-04-16 01:23

rear end.
 
I have just done ohlins springs, fork oil 10w motul and new pyramid seals as had slight leak, but now wondering of a new hyperpro spring on standard rear shock or is there any other ideas for a low budget. I am an xtx rider 09 and about 85kg

lankyrider 17-04-16 10:48

I've got the hyperpro spring for the original shock. It's a noticeable and welcome improvement, but it's no revolution. I think JMo likened it to bringing the rear suspension back to how the stock would feel new.

cam147 17-04-16 20:15

thanks
for that info lanky rider. the bikes done 20000 miles now so may consider it ..

Pleiades 17-04-16 22:26

Quote:

Originally Posted by lankyrider (Post 220699)
Bringing the rear suspension back to how the stock would feel new.

...is the perfect analogy.

A fresh spring is money well spent/worth spending... but don't expect miracles!

waynovetten 18-04-16 10:39

Quote:

Originally Posted by cam147 (Post 220693)
I have just done ohlins springs, fork oil 10w motul and new pyramid seals as had slight leak, but now wondering of a new hyperpro spring on standard rear shock or is there any other ideas for a low budget. I am an xtx rider 09 and about 85kg

Before you do anything I'd talk to Revs Racing and go through you options,if your in the West Mids You'll not have far to travel.

UKbri 15-09-17 04:10

Pleiades, do you remember what size the air gap was you used? I done my Hyperpro front springs about 3 years and 60,000 miles ago and think it's about time I replaced the oil lol. Back then Hyperpro just sent me a litre of oil and I used 500ml in each, can't even remember what grade it was. After reading your post I think I'll go for the 10 weight.


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