Mountain Biking - kona coil-coil?
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06-19-09, 07:35 AM
Well first of all I am not a frequent english speaker so my spelling can be in somewhat wrong so my apologyes in advance for that.
With that said I have some doubts because I intend to buy a 2008 kona coil air and I wold like to replace the rear air shock with a decent enough coil shock (a manitou swinger 4 or six way - most likely 4 way) and I'm not sure of how the bike will handle after the replacement. The reason I'm asking this is because I know that the suspension system is tuned for the air shock (a rising or slightly rising rate in order for the air shock to give a linear feel). I'm not completely sure if I expressed the suspension rate corectly but what I meant is that the force acting on the shock as it's going through it's stroke will increase to counter act the shock's rising rate. I know that the shock used has a bigger air chamber to eliminate the end stroke ramp up, but from what I have read, that is only a slight improvement (the shock will still experience the ramp up).
Does anyone have any experience with this? Is it ok to replace the rear shock?
I have some cycling experience (I ride now seriously for 3 years) and only rode hard tails (well I rode some full suspension bikes but those were cheep supermarket bikes). I can handle medium jumps and drops and would like to go full suspension.
The Coil-Air is really just an air-shocked version of the original Coiler, which did have a coil-over shock. The Coiler was offered 2004-2007 models and was then dropped in favor of just the Coil-Air.
You should be fine switching if you really want to but I have to ask: Why? Is your RP2 not working properly? Or do you just prefer the 'feel' of a coil-over?
06-19-09, 03:17 PM
First of all thank you for the answer
I have no experience with any kind of full suspension bikes and from what I read a air shock is more likely to blow a seal if used agressively (especially if used by a newbie).
Of course for the beginning I assume it will be ok but I would prefer the robustness of a coil (I can be very hard on the landings sometimes - I'm not that good :( ) and I'm afraid that soon after the new bike aquisition I will have to replace/rebuild the rear shock anyway. Since I have a great offer for a relatively cheap coil over rear shock (some old swingers) I would like to buy it now (the eye to eye measurement is ok - already asked that :D).
Plus from what I have read on the internet and what I know about air actuators/dampers (not much) I could say that it seems that a coil over shock would be plusher/smoother/more consistent through the whole suspension travel.
I also realize that a air shock is excellent for setting up the right sag for virtually any weight with no additional cost.
All of the things I have wrote are only suppositions based on prior knowledge and some relaxing readings on the internet. I don't know anything for sure and if I wrote something really ridiculous I am very sorry.
^^ I would not be hesitant about the new generation of air shocks at all. As you mentioned, the added beauty of them is that you can dial the air spring to your weight without having to worry about leverage ratios or buying other springs. Plus, when set right you virtually cannot bottom one out.
If you were going to race downhill, then I would say you want to go for the plushness and 'feel' of a coil; but for anything short of that, air should be fine. Heck, Transition Bikes (http://www.transitionbikes.com) specs RPs or DHX-Airs on a few of their bikes; and those are bikes built for serious abuse. Trust me.
My first 'real' shock was an old Fox Alps5 air shock that got raced downhill on a woefully-inadequate 4" travel frame - - off 4-foot-to-flat drops at times - - and never whimpered. And that was an early-generation Fox air.
I will add that it might be prudent to get the shop or an air-shock-savvy friend to help you set your shock up for you the first time so that you don't shorten its lifespan by incorrect initial setup. Refer to page 7 of this manual (http://www.konaworld.com/2008_tech_info.pdf) for some general air shock setup guidelines from Kona.
06-19-09, 04:43 PM
BR or Preston with an airshock is my dream bike.
06-20-09, 04:50 AM
thanks again for the answer.
this means that I will have some money left for another set of tires and some gear :thumb:.
air it is :)
06-20-09, 03:34 PM
I have used a coil shock on a "falling rate" frame designed for an air shock and it was not that bad.
It was a little harder to fine tune, but it worked. Specifically it was not easy to get sufficient sag and still have botom out protection. The comfort level was very good tho....
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