Progressive front springs?

[Sadanorakman]

Considering fitting progressively-wound front springs to my 2000SE, and am in the UK.

1. Anyone fitted 'YSS' springs and can vouch for their quality?

2. Anyone know how the Spring rate of these compares to the originals and also compared to the American 'Progressive' brand springs (Which are too costly for me because of import duties and tax)?
These are listed as:
Spring rate 1: 8.5 N/mm,
Spring rate 2: 12 N/mm,

3. Spring length:
These are quoted as 490mm long for years 1998, 1999, and 2000.
They also list a 520mm long version for 1988 through 1995.
Is this correct? Are the forks shorter on the later gl1500's?

Many thanks in anticipation

[newday777]

Personally having run the Progressive brand, stay away from them. I've bottomed the forks out on my 99 with them hitting a hard bump.
Get a single rate spring rated for your weight and load weights. Far better ride. Racetech and Traxxion both offer single rate springs.

[Sadanorakman]

Thank you @newday777

Very worthwhile considering single-rate springs I guess. Not sure how easy they will be to find in the UK though, and I would like to avoid importing if possible.

I guess I'd just like to stiffen up the front end a bit, as find it too vague, and it does bottom out a bit too easily. Fresh fork oil will help I'm sure, but I would like firmer spring rate too.

Does anyone else have the answers to spring length and rates that I asked please?

[newday777]

Even with straight rate Traxxion and Racetech springs you have to cut the included aluminum tube preload spacer when installing them. There probably won't be just specific springs without a preload spacer available.

[Sadanorakman]

Ok thanks. So you adjust preload by adding (or removing) a spacer. I didn't know that, but it makes mechanical sense I suppose.

[blupupher]

Do you have a fork brace installed?

[Sadanorakman]

Do you have a fork brace installed?

Am planning on fitting one at the same time as swapping the springs.