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-   -   Ohlins Rear shock (/showthread.php?t=31402)

swannymere 31-May-2006 20:29

Ohlins Rear shock
 
Will an Ohlins rear from a 749R fit a BP?

Sharpy G 31-May-2006 20:43

think you need the special linkage also and the later swing arm
G

Gizmo 31-May-2006 20:52

Quote:

Originally Posted by swannymere
Will an Ohlins rear from a 749R fit a BP?


no its a different stroke shock.

chillo 31-May-2006 20:53

Quote:

Originally Posted by Sharpy G
think you need the special linkage also and the later swing arm
G



special linkage???? whats that over a 'normal' one??

andyb 01-Jun-2006 09:47

This would actually be a good mod. You will need the 749r rocker and the 749r tie rod. Compared to the price of the shock these are not that expensive.

You dont need to change the swing arm!..............Technically the geometry is the same, but it sure looks a million time better!!!

As far as putting it on a bp......if you ride 2 up often then its probably not a good idea. If you want to improve your bp for mono riding then go for it!

chillo 01-Jun-2006 10:05

anyone got a pic of the 749r tie rod and rocker??

andyb 01-Jun-2006 10:35

yes..........

Gizmo 01-Jun-2006 10:40

All the welded swingarms are the same, there's no difference between R and base or Bip and as Andy says swap linkage and tie bar and it should fit on. One small downside is that the 749R also used a different head angle adjustor and fork offset to balance out the more linear rear set-up which was put in there to cope with bumps at high lean angles ( it makes it easier for the shock to move when already mid stroke). I'd think the shaft position will sit lower in the stoke more of the time because of the linear action so its maybe why it also got different offset adjustments to balance this for the track. The 749R is the only bike with that extra eccentric , 999R's didn't have it.

The benefits of this on the road are the way the suspension reacts more easily to small bumps the downside is that hit big potholes or big bumps ( not many of them on tracks) and you'll blow through the travel very quickly which was why the rising rate is used on road bikes. Depends what you are using the bike for I guess.

andyb 01-Jun-2006 10:42

1 Attachment(s)
749r rocker versus 999r (2003)

andyb 01-Jun-2006 10:44

1 Attachment(s)
tie rods.........749r is shorter....

andyb 01-Jun-2006 10:59

Interestingly the shock, rod and rocker are sold as an upgrade kit in the 2005 accessories book

part 96845103B

andyb 01-Jun-2006 11:03

and on from what gizmo says.............looking at the part numbers for the front end.....
the actual offset tube is the same 749r/999r....it appears the yolks have the slight difference, with both the top and bottom yolks being different part numbers.

chillo 01-Jun-2006 11:08

so after fitting this does back end of the bike sit lower??
i have still got the standard 'r' linkage/tie rod

been think about this also but unsure of the benefits, i have the 05 ohlins rear shock which has different bump stop i think? not sure of the change over earlier ohlins rear shocks?

(sorry, dont mean to hijack!)

andyb 01-Jun-2006 11:28

Quote:

Originally Posted by chillo
so after fitting this does back end of the bike sit lower??
i have still got the standard 'r' linkage/tie rod

been think about this also but unsure of the benefits, i have the 05 ohlins rear shock which has different bump stop i think? not sure of the change over earlier ohlins rear shocks?

(sorry, dont mean to hijack!)


No mate. Its got nothing to do with ride height...........that can still be where you want it.

Its about levers and moments. The movement of the rear wheel as it rides over an uneven surface, how this makes the swing arm go up and down which in turn moves the tie rod and shock.

Imagine closing a door by pushing on the outside of the door. That is easier to do than pushing nearer the hinges, but obviously takes more distance to achieve the same amount of door closure.

Gizmo 01-Jun-2006 11:37

2 Attachment(s)
Quote:

Originally Posted by andyb
and on from what gizmo says.............looking at the part numbers for the front end.....
the actual offset tube is the same 749r/999r....it appears the yolks have the slight difference, with both the top and bottom yolks being different part numbers.


totally different system as well as the fork offset Andy, notice the extra eccentric tube in the centre of the 749R

andyb 01-Jun-2006 11:41

yeah i saw that.........presumably you could get that seperatly as well...

Gizmo 01-Jun-2006 11:48

Quote:

Originally Posted by andyb
yeah i saw that.........presumably you could get that seperatly as well...


I havent checked the part numbers but would assume it forms part of the Ohlins race fork kit you can get in the DPP catalogue to match the rear. If you can't buy it as parts would it fit other forks, with different upper and lower crowns it might not, you can maybe buy the whole triple assembly.....

That's the problem altering one end of the suspension, it needs to have the same improvements to match it at the other :(

swannymere 01-Jun-2006 20:15

Is it worth doing?I've converted my BP to a mono,but as i understand it unless i can get the ride height adjuster and the linkage it won't work.

andyb 01-Jun-2006 20:17

Quote:

Originally Posted by swannymere
Is it worth doing?I've converted my BP to a mono,but as i understand it unless i can get the ride height adjuster and the linkage it won't work.

If i remember the linkage and rod were less than £100...........


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