Bicycle Mechanics - Steerer length for stem?
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Hey guys I am building up my frame. I bought the frame and fork used. The original owner said that the fork was cut for a zero stack height. I am assembling everything together. From the top of the headet to the top of the fork is 37.30625mm. Most stems have a 41mm stack height.
That means the gap from fork top to stem top is 3.69375mm. I see it recomended for 2-3mm. is this gap to big?
I know some stems have a lower stack (38mm) height so what is the biggest gap that is safe?
02-28-08, 08:21 PM
It is often recommended that the acceptable gap can be as large as 5 mm with no problems. I'd be a bit concerned with 5 mm if the steerer is cabon and no worries at all if it's steel or Al. Your 3.6 mm gap should be fine. I hope it gets the bars high enough as you have no room for further adjustment.
I'd try for a shorter stem. I also recommend that you not exceed 5nm when torquing the stem pinch bolt(s) regardless of the stem torque spec.
I found a stem that is a stack height of 37mm. Do they make 1mm or 2mm spacers? The smallest I see is 5mm.
03-02-08, 10:40 AM
03-02-08, 11:20 AM
If it doesn't fit it isn't a good deal regardless of price.
1. If you had a brand new uncut steerer, how high would you want your handlebar?
2. some carbon fork manufacturers actually specify that you install a short stack spacer ABOVE the stem so that the clamping force isn't applied against the top of the steerer.
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