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-   -   Problem (http://forums.pelicanparts.com/bmw-r1100s-r1200s-tech-forum/417917-problem.html)

Droptarotter 07-07-2008 09:16 PM

Quote:

Originally Posted by roger albert (Post 4044683)
It may feel good, but that doesn't mean it works well, or is safe.
It's actually a pretty decent setup, except for the front sag, which is low enough that it is easy to top when the front goes light cresting hills or going over the leading edge of dips.
That low of a sag just kills traction when topping too much. Be careful there.

Hey Roger;
Was that comment directed to my post about my settings?
If so, what do you recommend for a front setting?
When you say low enough, did you mean too little sag?
I was surprised when the tech left the front at that setting, I thought it should have been around 30mm.
The guy was going to call a friend of his at Ohlins to see if he had any recommendations for my bike.
Thanks for your help.
Cheers

roger albert 07-07-2008 10:32 PM

Hi,

Yes, but I worded it poorly. Sorry. I meant to say the sag was low, and thus the front end high. Even 30mm is a low sag figure for a front end. A lot of factors come into play, but typical numbers are 35-40mm. Two issues here: Front travel left in absolute terms to prevent topping, and front height vs rear for good geometry. Assuming you want to stay with 25mm sag in the rear, I'd experiment in a range of 30-35 in the front. Look for a good stability/agility tradeoff in that range. 25mm in front on a telelever can leave her a bit twitchy too (would be opposite for a telescopic)

The exact amount will be partially down to personal taste, but I'd dial in AT LEAST 5mm more sag in the front and go from there.

hth
roger


I'd personally prefer a bit more sag in the rear too, but 2

Guest24 07-08-2008 07:22 AM

Roger, I've checked the total sag on the front by buy placing a zip-tie on the front slider. I take all the weight off the front then lower it and place the rider in position to compress the strut. after the rider is off, I raise the bike to a no-load position and see how much the strut diaplaced the slider. the rider can bounce te struts to assure that the laden sag is free from any friction error before the zip-tie is set.

roger albert 07-08-2008 07:47 AM

that's just what I do when I dont' have an assistant that allows me to quickly measure everything directly.

Droptarotter 07-08-2008 07:36 PM

Roger;
Do you recall how many mm of change with each turn of the front adjuster ring?
Thanks for your help.
Cheers


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