Swingarm full range of motion

Norbi said:

I found this in a German forum (auto-translated), maybe helps:

“- I have measured the steering factor (spring travel/damper stroke) again (several times and with greater effort) and come to approx. 3,1. So far, I had written about 3.36, which I hereby revise with remorse. 1 cm stroke of the damper thus corresponds to about 3.1 cm change in height of the saddle, measured from the wheel axle vertically upwards to the lower edge of the saddle. It was measured with the Bilstein spring strut with removed spring. The stroke of the leg to stop buffer is 30.4 mm, when using this stroke, the rear height (verpenal axis to saddle lower edge) changes by a good 94 mm.”

Scrambler/UGS: Vergleich Federbeine Sachs - Bilstein - Wilbers 642 - BMW R nineT Forum

Noch ein Federbein-Trööt :kasper Nachdem ich nun 3 Federbeine für den Scrambler habe, möchte ich diese mal gerne als Entscheidungshilfe für Unentschlossene gegenüberstellen. Gleichzeitig muss ich einige Werte korrigieren, die ich in vorhergehenden…

www.ninet-forum.de

See if you find out more there with auto-translate.

I just measured my bike (on center stand, so rear wheel off the ground).
At 5“=125mm movement of the wheel, I‘d have contact of my hugger with the underseat!

So, if the rear shock really travels the stated 4.7”=120mm, and there’s a 3.1 leverage factor, then… what?!?
Now I’m confused. Either the shock doesn’t use its full extention (what’s the point of that then), or something else is off with this math. Good thing I’m not an engineer.

Now I try my common sense method: Maybe, just maybe, the stated 4.7”/120 mm is actually measured in the rear, (and the shock itself therefore moves only 120mm/3.1, therefore 38.7mm or 1.55”)? That sounds a lot more like the numbers of the guy above.

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GapRunr said:

Suspension travel is listed as 4.7". I'd assume that is at the rear axle. You could remove the shock and see what the potential travel of the swing arm measures as it will be much more, but the shock will limit the up and down stroke to 4.7" of travel.

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rich46 said:

Not so much about the info you are seeking Blitz but may I make a point for the future ? You are speaking of wheel travel "not" suspension nor swingarm travel. This might only be of import when fitting shocks (shock) and figuring spring rates (because of mounting angles) but we should not be confusing some of the Newbee's or go off in the wrong direction next time we discuss suspension and set up. No offence intended as what you were asking was totally valid and made sense in the context it was asked. I've just seen the term used this way before in reference to set-up so this is why I butted in.

Cheers

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rich46 said:

Blitz; when you have time send us some pics. Highway 1 up the coast is truly a once in a life time ride. One summer between jobs I rode from San Francisco to the ferry in Washington , up Vancouver Island .over to Prince Rupert and on to Cold Foot where after talking to a trucker I gave up going any farther. My plan was to ride to Dead Horse stick a toe in the water there and go home. I chickened out after talking to a trucker who reminded me that in Alaska September was late in the year and I might end up staying in Dead Horse for 6 months. That ride along those coast lines was a one off ride that I'll always recall. Cheers

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