Old 10-11-18, 10:14 AM
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Bikes: '87 Miyata 912, '87 Schwinn Prelude, '90 Fuji Saratoga, Black Mountain Cycles Monstercross V4, '89 Novara/Centurion Ironman, '18 Diamondback Syncr, '18 handmade steel roadbike

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Originally Posted by 1-track-mind View Post
Ok, then. Let's talk ideal geometry for an XL frame with .9/.6/.9
Let's start with a seat tube angle of 73, chainstay at 450...what else ?
73deg seat tube, 72.5 or 73deg head tube, 50 or 55mm fork rake(depending on head tube angle and style of riding) for stability under 30mph and for a nice front loaded rack setup.
depending on 72.5 or 73 HTA and 50 or 55mm fork rake- you will get a trail of between 49 and 58mm, the 49mm of trail is with 73HTA and 55mm fork rake for the least trail of the different combinations.

As for stack, reach, and bottom bracket height- all those would be dependent on the actual frame size needed. I would certainly want a taller head tube to allow for fewer spacers. most likely a 6degree sloping top tube to help with stack height and make mount/dismount easier.
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