bmwpowere36m3 Posted March 24, 2016 Share Posted March 24, 2016 @twf or @pattonme Do either of you know the stock preload on the spring? Based on the free and installed lengths in the manual it's only 7 mm... Link to comment Share on other sites More sharing options...
bmwpowere36m3 Posted March 24, 2016 Share Posted March 24, 2016 I have yet to measure fork sag myself... but I haven't seen any members post anything either. I think the bike is too new and membership is skewed towards novice/budget riders. Meaning those that don't focus on suspension or those technical details... not to be negative, just reality. Link to comment Share on other sites More sharing options...
twf Posted March 24, 2016 Share Posted March 24, 2016 @twf or @pattonme Do either of you know the stock preload on the spring? Based on the free and installed lengths in the manual it's only 7 mm... 16mm When you take cap off spring and spacer are flush with top of the tube. Meaning cap length is your preload, part of it that goes inside tube, + washer. Cap + washer is 20mm long. Which preloads springs 20mm but 4mm of that is top out spring. ~7mm in manual would be correct if you account top out spring been fully compressed. Link to comment Share on other sites More sharing options...
bmwpowere36m3 Posted March 24, 2016 Share Posted March 24, 2016 http://www.racetech.com/html_files/preload.htm If I understand that correctly and the manual, then the actual preload this 7 mm. Since the fork extends due to the topout spring. Link to comment Share on other sites More sharing options...
twf Posted March 24, 2016 Share Posted March 24, 2016 You asked for installed preload. It would be if top out was fully compressed but it is not. When you install spring and put cap on your fork grows up 4mm (stock spring). This is your fork length with no load on it. It can extend more but needs force to do it. Stock spring and stock spacer do not fully compress top out spring, only about third of it. Link to comment Share on other sites More sharing options...
bmwpowere36m3 Posted March 24, 2016 Share Posted March 24, 2016 You asked for installed preload. It would be if top out was fully compressed but it is not. When you install spring and put cap on your fork grows up 4mm (stock spring). This is your fork length with no load on it. It can extend more but needs force to do it. Stock spring and stock spacer do not fully compress top out spring, only about third of it. Gotcha, so they must list "installed length" as with the top-out spring fully compressed as you said (which is kind of pointless IMHO). Additionally your measured spring length is a little longer than listed (granted I'm sure there's a length tolerance). Link to comment Share on other sites More sharing options...
twf Posted March 24, 2016 Share Posted March 24, 2016 They used to list weight of the bikes without any fluids, pointless as well since you can't ride it that way Link to comment Share on other sites More sharing options...
bmwpowere36m3 Posted March 24, 2016 Share Posted March 24, 2016 They used to list weight of the bikes without any fluids, pointless as well since you can't ride it that way That's a little different... lighter is always better Link to comment Share on other sites More sharing options...
twf Posted March 25, 2016 Share Posted March 25, 2016 btw. where is this thread about wrong bushings I keep reading about? Link to comment Share on other sites More sharing options...
JanM Posted March 25, 2016 Share Posted March 25, 2016 btw. where is this thread about wrong bushings I keep reading about? http://fz07.org/thread/2223/wrong-bushings-installed-factory-ensues Link to comment Share on other sites More sharing options...
pattonme Posted March 26, 2016 Share Posted March 26, 2016 alright, Zoran (aka @twf) wins this round. I measured again (assuming @merc16's forks are stock) and came up with 0.79-0.82kg/mm. So my heartfelt apologies to those who bought 0.85's from me based on erroneous data. Link to comment Share on other sites More sharing options...
Premium Member merc16 Posted March 27, 2016 Premium Member Share Posted March 27, 2016 They are stock and I bought the bike new. Link to comment Share on other sites More sharing options...
bmwpowere36m3 Posted May 26, 2016 Share Posted May 26, 2016 Measured my fork sag tonight (stock forks)… plans to upgrade forks. Bike full of fuel, Akra exhaust, radiator guard, frame/axle sliders, mini front LED turn signals, integrate taillight (no rear turn signals), fender eliminator…. Static sag 20 mm and 37 mm race sag, suited up weight of 190 lbs. Link to comment Share on other sites More sharing options...
atxjax Posted June 24, 2017 Share Posted June 24, 2017 Would 1.0KG/MM spring be too much? Link to comment Share on other sites More sharing options...
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