Adjustable front shock - K-Bikes.com - Excellence in Motion
 
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post #1 of 6 (permalink) Old Nov 4th, 2007, 1:31 pm Thread Starter
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Adjustable front shock

My '04 KRS is going for warranty work (heated grip and final drive leak) which is going to involve having the plastic and rear drive off. It seems like a good opportunity to upgrade the suspension. On their website, Ohlins recommends an S36D front, and S46HR1C1LS rear. The rear is, of course, adjustable for bump and rebound, but the front shock is adjustable only for preload.

Searching around, I also see that the S36HR1C1L can also be fitted to the front. It, too, is fully adjustable like the rear. I don't remember hearing anybody talking about the issue of adjustable vs. non-adjustable front shocks. Many have talked about how the new suspension transforms the bike, and I have just assumed that everybody was talking about a "fixed" shock in front.

Now that I'm thinking about shocks I see that many bikes still use conventional forks and, when upgrading forks, the new forks are fully adjustable...without a second thought.

The adjustable front shock for the RS is about $250 more. CanI have your thoughts about whether or not it's something to consider? Thanks, Bill

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post #2 of 6 (permalink) Old Nov 4th, 2007, 7:40 pm
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Just curious...when they say the front is adjustable, what are they offering?

There's hydraulic preload vs. locking rings (locking rings are a pita), rebound, low speed compression and high speed compression.

But, if you're going to be on the track as well as the road, having adjustments is a good thing...second thing is to have someone who does suspension settings give you a short course on how to set it up for your riding style.



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post #3 of 6 (permalink) Old Nov 4th, 2007, 8:11 pm Thread Starter
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It looks like this is the shock they're talking about: http://www.ohlins.com/Motorcycle/Pro...7/Default.aspx

This shock is adjustable for bump and rebound. Looks like no hydraulic preload - I guess they set the preload when they set the sag and call it a day.

I know about tuning suspensions from my SCCA days. The question is whether this adjustability is going to change my life on the bike. FWIW, the shop suggests only the non-adjustable shock for the front of the K1200S.

I'll get them on the phone tomorrow and report back if I learn anything useful. Thanks Ray.

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post #4 of 6 (permalink) Old Nov 5th, 2007, 12:29 pm
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I went with the Ohlin's front and rear on my 02 KRS. BM701, BM702. The front isn't adjustable except for the locking rings that adjust preload. Rear is fully adjustable. Paid $1852 including install. Locking rings are a PITA. Not something you'll want to get off and adjust during a ride.

IMO adjusting damping and preload on the front just isn't needed that often unless you're racing. Load stays pretty constant on the front even with a 130 pound passenger. Rear is a different story. I adjust my rear preload when riding two up or using bags. Damping is a fine line unless you're very familiar with shock tuning. I pretty much leave mine alone.

I'm relatively happy with the results. If you weigh within the BMW stock shock parameter of 175 lbs, you probably don't really need Ohlins. The only reason I spent the money was due to bottoming out with passenger. I weigh about 230. Heavier rear spring helped. The front spring is the same no matter what you weigh. Ohlins only has one front spring for any RS. Ohlins is a good suspension system, but don't expect miracles.
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post #5 of 6 (permalink) Old Nov 5th, 2007, 12:30 pm Thread Starter
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I spoke with the shop this morning: http://www.propilotsuspension.com/

They say that the adjustable shock for the RS is good. They also have an adjustable shock for the new S. It is adjustable for preload and rebound, but not compression.

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post #6 of 6 (permalink) Old Nov 5th, 2007, 9:36 pm
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The Wilbers I got for my GT had no hydraulic pre-load adjustment available for the front, either, just the rings. Fortunately, they set it up almost spot on. I guess the front doesn't get extra weight on it regardless of the load.

Good that you've got some shock tuning expertise from the past, as some of that tweaking can drive you nuts if you don't know why it's being tweaked.

Watched as Dave Moss played with mine a bit the previous weekend. Set up well, just a bit more on the rebound and it was blessed as good. He was using a front wheel chock, and it was the first time I've seen someone adjust the suspension by adjusting the rear to match the operation of the front. Maybe they all do that, I just hadn't noticed before...

Also suggested that I crank in all the rear preload for track school and half a turn on the rebound (more damping). Good stuff, good guy to talk to.



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