Triumphrat

127mph · 04-02-2006, 01:01 PM

Hi,

I've put Ikon shocks on the rear of my Thruxton and they are a great improvement over the stock shocks. Yesterday I fitted Ikon progressive springs and replaced the fork oil with 15 wt. Seems like there is very little sag compared to the OE forks. Anyone out there done the same mod? How do you find them? (tighter coils uppermost)

The original forks were way too "squishy" and didn't give me a whole lot of confidence in curves with an ubdulating or bumpy surface, that's why I changed to the progressive springs.

127mph · 04-02-2006, 01:05 PM

I forgot to ask, regarding the spacer, the Ikon's are much longer springs than the originals, so I had to cut down the spacer to about an inch and three eighths. Did you find the same thing?

rodburner · 04-02-2006, 02:11 PM

Thats probably why there`s no sag.The spacer pre-loads the springs.On the Bonnie,you don`t use any or very little spacer.

dgilmore · 04-05-2006, 08:51 PM

When I did my wife's Thruxton, I used 10wt oil, as she only weighs 100 lbs. I also used a 30mm spacer, as per Ikon's instructions, and the results seem quite good. I don't ride the bike, as it's set up for her, and I'm over twice her weight, but she feels like the set-up is just about right. It doesn't seem to have a great deal of sag, but performs quite well. How much oil did you use, as the amount as well as the weight will affect performance. I can't remember exactly how much air space I used, but if you want to know, I can go to the garage and check my fork oil guage, as it hasn't been changed since I did her bike.

Dave

127mph · 04-07-2006, 11:38 AM

Thanks dgilmore. Couldn't get back to you sooner, I've been out of town.

The instructions that came with my Ikon springs did not mention a 30 mm spacer, but it seems about right. I used the exact volume of oil (but 15 wt instead of 10) as per the Triumph maintenance manual. It makes detailed reference to the height of the oil as well, I put in the correct volume, but with the new longer springs the height of the oil up the tubes would be more, so I didn't measure it. I figured as long as the volume was as per the manual, it should be OK.

Will ride some miles this weekend, and see how it goes. I like it that the sag is much less than before, and was interested in others experience of this.

dgilmore · 04-08-2006, 11:50 AM

Howdy 127mph, when I first got my wife's springs, I laid them out on the worktable, and compared their length to the length of the old springs + spacer. The new springs alone were 30mm shorter, so I emailed Ikon and asked them if I should use a 3omm spacer to make the overall length the same. They replied that their recommendations were for exactly that, so that's what I did. As to the amount of oil, I figured that since the springs were much more substantial, they would raise the oil level in the forks (thereby making the forks stiffer), so I used a fork oil gauge, and set the oil level at 135mm. The forks seem to work well, hope your experience is just as good.
Dave

RaceDweeb · 04-08-2006, 04:50 PM

I'm a big boy (313lbs). Thruxtonone rebuilt my T100 forks with his stock Thruxton internals and caps and we opted for 50mm.

I have not installed the forks yet, so I can not comment on ride quality.

curefan · 04-08-2006, 11:47 PM

Yes, I encountered the same thing. I cut a spacer from PVC to match the length of the original spring and spacer. I used 10 weight the fork oil at the level recommended in the manual. I'm very happy with the improvement.