Fork steerer lengths Do mfrs measure above or below crown?
Trail-blazer
Posts: 129
Right had a bit of mare? Bought some forks on eBay listed as having a 255mm steerer. I've got a retro GT that has a 160mm head tube so I need a usable steerer length that is 250 long.
Only one problem. The guy measured from below the crown so I've only got 225mm of steerer which is 20mm too short. I assumed everyone selling forks measured from above the crown - how else would you know if they'd fit your bike?
The manufacturers state this fork has a 255mm steerer. :?
So what's the craic - do fork manufactures measure steerer length from above the crown or below?
Only one problem. The guy measured from below the crown so I've only got 225mm of steerer which is 20mm too short. I assumed everyone selling forks measured from above the crown - how else would you know if they'd fit your bike?
The manufacturers state this fork has a 255mm steerer. :?
So what's the craic - do fork manufactures measure steerer length from above the crown or below?
I had my sig deleted and all I got was this snide replacement. Not happy. 
0
Posts
it is from where the crown sits. any other measurement is useless.
Parktools :?:SheldonBrown
My thoughts exactly but the eBayer seller is saying that the forks are 255mm long and uncut and the factory website says the forks have a 255mm steerer so either they've had 30mm lopped off them or that's how the factory measures them. :?
what is the fork?
Parktools :?:SheldonBrown
"I've got a retro GT that has a 160mm head tube so I need a usable steerer length that is 250 long. "
How does that work? 40-45mm stack height for a typical stem, 30mm for a headset...
I'm running the Crank Brothers Cobalt headset with a Pro FRS stem as I was in a similar, but self-inflicted, situation to you.
That figure was me being uber-cautious and allowing for 20mm worth of spacers. If the spacers weren't needed, I could always have trimmed the extra 20mm from the fork as it's easy enough to shorten a steerer but not so easy to lengthen one.
I think I can get away with using a 35 - 40mm stem with my current headset with no spacers (or one 5mm spacer if I find a 35mm stem) and a stem with a bit of rise and a riser bar if the front end seemed a bit low . I know FSA do 35mm stack height stems but they all seem to be from the OS range.
Anyone know of a 35mm stack height stem for standard bars?
might be worth giving a clue as to the length you may have been looking at.
Parktools :?:SheldonBrown