Suspension travel length GS Vs GSA HOW???

[sproggy]

Baz, I think you are confusing (in your most recent post and others) suspension travel, ground clearance and shock length.

Ground clearance is nothing at all to do with suspension travel.

Suspension travel is not directly related to shock length.

Differences in suspension height or ground clearance are not equivalent to differences in shock length, although they are proportional.

The latter is because the shocks are not attached at the ends of the wishbone/swingarm, but much closer to the respective pivot points. A difference in shock length, assuming an equivalent spring rate, is therefore magnified at the axle. This is why 10mm of preload will result in the rear of the bike rising (unloaded) by significantly more than 10mm.

 

[Bikerbaz78]

Having read my own post tonight I think I confused myself!?

That was all copied and pasted from that other site!?!?

DOH.....

 

[elevensies]

Bollocks

why is it bollocks?

i only assume you say this because you have had both shocks in your hand, examined them, and measured them, and serviced the shocks, etc etc?

 

[Welshman]

why is it bollocks?

i only assume you say this because you have had both shocks in your hand, examined them, and measured them, and serviced the shocks, etc etc?

I have exchanged my 1150 rear shock for an 1150 GSA shock it is longer, it has more travel it is a far higher spec shock than the stock GS shock, it does not have the same spring, however... African spec models often are not what you get in Europe, I could be wrong, front I am running a modified WP rear a stock GSA

My info says about 8 to 10mm more shock travel translates into 20mm at the wheel but the quality of the damper is higher they on the ADV HERE

 

[lkyphl]

Here's another point to consider, Baz ;

If the maximum travel of a front shocker is 67mm (take the spring off and measure the amount the shocker can physically move ; on both my standard and Ohlins shocks it's about 67 mm), and the shocker is mounted almost exactly 2/3 of the distance from the Telelever engine pivots to the fork bridge, how can suspension travel be 190 mm ? Seems to me the maximum travel can only be 67 X 3/2 = 100mm.

Maybe the travel is measured with the shocker removed .....

Phil

 

[Johny w]

Here's another point to consider, Baz ;

If the maximum travel of a front shocker is 67mm (take the spring off and measure the amount the shocker can physically move ; on both my standard and Ohlins shocks it's about 67 mm), and the shocker is mounted almost exactly 2/3 of the distance from the Telelever engine pivots to the fork bridge, how can suspension travel be 190 mm ? Seems to me the maximum travel can only be 67 X 3/2 = 100mm.

Maybe the travel is measured with the shocker removed .....

Phil

The shock on its own is different, we have the forks and the telelever to consider ..... I've also read 190mm total travel.

 

[MikeO]

Holy resurrected thread, Batman!

 

[Johny w]

Holy resurrected thread, Batman!

Didn't realise it was so old

 

[SBD]

The Verdict!

This site is "The Don"!

http://www.bmbikes.co.uk/specpages/R1150gsadventure.htm

GSA

Seat Height
900 mm / 35.43 in (special equipment low seat bench: 860mm / 33.85 in)

Travel Front/Rear
210 / 220 mm (8.26 / 8.66 in)

GS

Seat Height
840 / 860 mm (33.07 / 33.85 in)

Travel Front/Rear
190 / 200 mm (7.48 x 7.87 in)

So despite the apparent "same" visible clearance between the telever and the cyclinder head the front shock of a GS and GSA the GSA IS actually 20cm longer than the GS! Front AND Rear

A whopping 60cm maximum difference between seat heights at the extremes!

Does this mean I could touch the floor with GSA shocks and the low BMW seat?????????

FOOK knows?

60mm, Not 60 cm. That’s nigh on two feet and neither of them would touch the floor…

 

[Riceburner]

Just a thought on this: do both bikes have the same diameter front wheel? (I'm assuming they do, given that it wasn't mentioned at all).

 

[MartinK]

Just a thought on this: do both bikes have the same diameter front wheel? (I'm assuming they do, given that it wasn't mentioned at all).

Yes, the water cooled ones definitely do, I have GSA wheels on my GS

 

[Riceburner]

Yes, the water cooled ones definitely do, I have GSA wheels on my GS

Thanks for reminding me to change the coolant in the Rocksters.