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captainscarlet

Paging the suspension gurus

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My third post in as many days regarding suspension.  This whole business is a minefield and I have found myself swinging from one idea to the next, but now think I'm closing in on a solution.

To provide a complete picture I am 85-90 kg/190-200 lbs in full riding kit.  I ride almost exclusively solo (no pillion) and rarely have luggage.  Most of my riding is done on relatively small roads with sweeping to twisty bends and generally poor surfacing often damaged by winter frost heave.  Up until today I've been using the original Dunlop D222 tyres but these are about to be replaced by a set of Pirelli Angel GTs.  I have set my rider sag front and rear aiming for 30% of suspension travel which is basically 40 mm.  I'm maxed out on front preload which gives me 43 mm, almost the 40 mm I'm after.  At the rear I'm on the softest setting which gives me 33 mm, which is quite some difference from the 40 mm I'm looking for.  So I'm at the limits of preload adjustment at both ends and have no room to play with.

Now my current idea is to buy a new shock and replace the fork springs and oil.  I have been weighing all kinds of options including new fork cartridges but have decided, based on reading here and elsewhere, that good improvements can be achieved by replacing fork springs and oil.

I can buy a K-tech Razor R Lite shock and K-tech fork springs for SEK 5000 (including shipping) which is around $550.  I have also been considering the Nitron NTR R1 shock and also the Öhlins YA335 but have determined from numerous posts from @pattonme that the K-tech appears to offer the most bang for the buck.  Plus those other two shocks cost more than the shock and spring combination that I can get from K-tech.

So my question is does that panel and @pattonme think I'm making a reasonable choice?  I would also appreciate advice on spring rates for the fork springs.  I have read on this board that @piotrek and others in my weight class have chosen 9 N/mm.  A visit to Racetech's spring calculator told me I need 8.5 N/mm.  I'm also given to understand that it is advantageous to choose a lighter weight fork oil than that specified in the manual and also a different oil height.  Any guidance there would be appreciated.

CS 

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12 hours ago, captainscarlet said:

...I have read on this board that @piotrek and others in my weight class have chosen 9 N/mm.  A visit to Racetech's spring calculator told me I need 8.5 N/mm.  I'm also given to understand that it is advantageous to choose a lighter weight fork oil than that specified in the manual and also a different oil height.  Any guidance there would be appreciated.

I reached out to @stoltecmoto for springs, and I was told to account for weight of any accessories that I'd add to the front of the bike, and that made sense to me. I added the crash bars, large screen, tank bag, lamps, GPS and all the bracketry. The 0.9kg/mm rate was recommended, and it is perfect for me, in that I only need about a turn or two of preload. Oil weight and height are really trial and error. Remove the right leg, dump the oil (no need to remove spring, see this video) and replace that quantity with something much lighter. Go for a ride and see what happens. The quick-and-dirty way to see if damping improves enough not to warrant replacing internals (springs excepted)... then service/rebuild your forks properly.

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