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  #1  
Old 4 Weeks Ago
smokin's Avatar
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Sportster/Buell Model: 883R
Sportster/Buell Year: 2003
Sportster/Buell Model #2: 2003 883R
Other Motorcycle Model: Heritage Springer
Other Motorcycle Year: 1997
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Default 2003 883R Progressive Fork Springs?

I have a 2003 883R that I wanted to install the Progressive HD fork springs (I weigh about 230)
The Progressive web site says the HD springs with the heavier springs does not fit?
Why would that be? I'm pretty sure the forks are the same as a stock Sportster from 2003 with the dual disks being the only real difference...
Anyone know for sure?
thanks
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Default

Here's the Sportsterpedia section on Forks:
http://sportsterpedia.com/doku.php/techtalk:evo:susp01

Looks like the Std & Custom & R all use the same forks for 2003...


Here's the section on my 1994 Front Forks Specs:
http://sportsterpedia.com/doku.php/techtalk:evo:susp01c

and here's my thread on installing Progressive Fork Springs in my 1994:
http://xlforum.net/forums/showthread.php?t=2006111

Note my comment in that last linked thread: "(I have not actually measured any of the other kits, but if they include the same spring with simply different length spacers, you could buy any of these kits that were offered for a good price & then make your own spacer for your own forks... Just a possibility...)" This provides the possibility of buying a used kit (cheap) intended for another year/model, but use the springs (if they are the same) by providing your own PVC spacer...

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Sportster/Buell Model: 883R
Sportster/Buell Year: 2003
Sportster/Buell Model #2: 2003 883R
Other Motorcycle Model: Heritage Springer
Other Motorcycle Year: 1997
Reputation: 1495
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Thanks!
I'm not as interested in comfort and certainly not lowering (unlike most riders on the forum)
I live minutes from the Tail of the Dragon and the 883R is my "sportbike" !
I put the old 1200S Remote Res shocks on it with much heavier springs off a 1986 Honda Magna (tip from another Forum rider!) and still have the factory springs with a spacer added and 10W fork oil - better, but I'm too fat and need a heavier spring
Since it looks like all the 2003 use the same forks I'm ordering the "HD" springs from Progressive and put fresh oil in and give it a try!
Thanks again
-Brad
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Tomcatt Tomcatt is offline
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Quote:
Originally Posted by smokin View Post
I live minutes from the Tail of the Dragon and the 883R is my "sportbike" !
Then I would suggest NOT using Progressive springs. You get a 35/50 or 44/71 lb/in rate and at 230 lbs you want ~ 55 lb/in, 1.0 kg/mm (or higher) rate.

I've got .95 kg/mm, 53 lb/in springs in my 1200C and they could be stiffer. I'm 220 lbs in street clothes.

With modern forks progressive springs (and they're not real progressives, they're dual rate) are pointless. You use a single rate spring and adjust how "progressive" your effective rate becomes by raising or lowering the oil level.

https://www.racetech.com/ProductSear...ster/1994-2003
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After many years of using progressive rate springs on various motorycles i eventually installed Straight Weight fork springs. I also used Intiminators valving with the straight weight springs on my 2008 Sporty, a very dramatic improvement. Even though i still have progressive 412s in the rear which are better than stock but still a poor shock. ( they will go also, when i have funds )
I will never use progressive springs on a motorcycle again.
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Ill weigh as much as 220, and ride two up 25% of the time.

On a 1996 1200 custom (19 inch front wheel if it matters)
The stock springs had brutal brake dive and would bottom out easily.

I changed to the progressive brand springs. This was a huge improvement. I resealed the forks and set the fluid level near the highest permitted.

I have nothing else to compare to, but I'm happy with it.

On another brand of bike, I put progressive rate springs in, and I promptly took them right back out...
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Quote:
Originally Posted by Maxeffort View Post
I changed to the progressive brand springs. This was a huge improvement.
Almost anything is a huge improvement over the OE set up, even Progressive Suspension springs.
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Yes. Anything is an improvement over stock springs. On my 2008 i had previously changed from stock springs to progressive. I experimented with spacer heights, oil viscosity and oil volume, had managed to decrease dive which was good for harder braking. However when i went to single rate it was a massive improvement. Even now i sometimes still brace my body and gringe when approaching some bumps out of habit from the previous progressive springs that i installed. But now front end smooth.
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