So the new bike fund for a full susser went to a new singlespeed. So this 2006 classic will be riding the Alps for a summer holiday.

It’s been out of action for over two years.

Do I spend £100 getting it’s Fox RP23 serviced (doesn’t damp very well and sits into its travel even at higher pressures) or should I buy a modern shock such as a Fox DPS? Even when the RP23 is in good working order I always felt it sat into its travel a bit too much and not enough difference with Propedal on.

I was leaning towards a DPS but I can’t find much about the 4 digit factory tune codes and a lot of the cheaper shocks are OEM for random bikes so not sure how it would ride. They seem to be about £250.

I’ve seen a 2018 DPS from a Yeti SB5+ 2nd hand for £140 but I don’t know how to work out if the bikes have similar characteristics (rising/linear rate and all that)

I had a Vorsprung Corset on the RP23 on my Yeti 5. It transformed it.

https://www.tftuned.com/vorsprung-corset-air-sleeve/p3135

Put the 4 digit tune code in here Fox

^ that shock is from long before Fox started cutting codes on shocks.

^ that shock is from long before Fox started cutting codes on shocks

I was leaning towards a DPS but I can’t find much about the 4 digit factory tune codes and a lot of the cheaper shocks are OEM for random bikes so not sure how it would ride. They seem to be about £250.

Apology accepted

Sorry I missed that part about the DPS.

As you have a shock that’s been pushed already (and likely don’t know what the tune is) I would personally send that back to TF to get it serviced and re-valved, the DPS isn’t going to be a game changer, I would stick with a tuned RP23 over a DPS as its a pretty compromised shock.

Thanks for all your thoughts, I hadn’t realised the DPS shock may be inferior to the RP23.

I have been wallowing through pages of opinions and leverage/mechanical efficiency/rising rate/digressive stuff, got thoroughly confused and I think I’ve now worked out that my suspension design is falling rate aka Digressive. Low initial leverage (probably why it climbs so nicely) which increases into the stroke which keeps it plush (aka wallowy) by counteracting the shocks increasing spring rate.

Lots of people including Yeti saying the 575 is not suited to a coil shock due to this falling rate, so that makes me think the Vorsprung Corset would not be suitable as it would make the shock less progressive and result in an even softer mid stroke.

But then of course Vorsprung say that the corset sleeve would reduce the initial spring rate, so I would run a load more pressure to maintain the correct sag, and in turn this would provide more support in the mid stroke.

Confused! I might just do a home service and see what its like, last time the shock needed work the nitrogen had mixed with the oil which would needs specialist kit to sort out, it doesn’t feel as bad this time so perhaps its just short on oil. I don’t really want to spend £100 on a service and a £90 corset on top…

Dogbone, I just re-read your post and realised you had the Corset on a Yeti 5, not a 575. I think thats a linear suspension design which would certainly benefit from the corset.

My 575 has (frame cracked, now on the garage wall) a push tuned shock, not sure if you can still get that done. I don’t remember it having the same issue with it sitting low in the travel. Great bike.

Yeh mine was also Pushed a few years ago 🙂

I had my RP23 on my 575 Pushed by TF at the time and it resolved the mid-stroke wallow issue.