Crestline Bikes

E Bob

Well-known member
Feb 15, 2021
357
352
torfaen
it's 12mm for -5, could be 10mm for +5 as your raising the bike slightly when it moves forward, i set up 25% rider sag both ends & For me on fast, flat, mild steep it noticibly lost front end grip, even bike park steep it wasn't as planted. BUT... This is just my experience... i'm not one for geeking on measurements but i knew the bike had lost grip over that 2 Deg, Nothing stopping you trying both set ups, easy enough to knock out/in
 

RoJo

Active member
Apr 24, 2019
203
173
Surrey
That is pretty sweet "mess" in the background by the way. I'm not sure that adding 15mm slackens by 2 deg, the maths just doesn't stack up (if you excuse the pun). I reckon about 0.4deg per 10mm of fork length.
This was calculated for my Firebird 29:
PivotHead AngleAxle to CrownzCrownxFront CentreWheelbaseRear Axle to CrownaAxle to CrownaWheelBase to Rear Axle to CrownReachStackCSBBDroplRADaRAD
170mm Fox36
65
582​
527.4711​
245.9638​
1217​
1105.051​
86.489​
28.511​
455​
612​
431​
29​
762.6067​
53.37052​
+17mm Cup
64.27893
599​
539.6496​
259.9603​
1224.281​
1105.051​
86.489​
29.23207​
447.2621​
617.6776​
430.9659​
23.57599​
762.6067​
54.09159

 

E Bob

Well-known member
Feb 15, 2021
357
352
torfaen
i'v honestly not got a clue re all the numbers, Alls i know is after -5 install the bike felt high and lost grip at speed in the front, This led me to check the HA, it measured 61,62 with -5 cup, 63,64 without. But Forget all the Numbers the Main thing is The bike Steers well. Holds a line when its rough. Attached is her sat high on the cup...
IMG_6467.jpeg
 

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