Bike Forums > Steerer Length Question
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 02-25-11, 05:11 AM #1 guywithchickens Junior Member Thread Starter   Join Date: Oct 2010 Bikes: Posts: 12 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) Steerer Length Question I'm getting ready to order the parts for a fork, but I'm not sure how to calculate correct steerer length. Specifically, how much steerer goes inside the fork crown? Here's my simple steerer length math: Headtube Length = 180mm Stack Height = 32mm (estimated, don't have headset yet, but it's 1" threaded) Penetration into fork crown = ?? (about 1" or 25mm?) So: 180 + 32 + ?? (25?) = 237mm Another issue: Nova has a 240mm threaded steerer, but it's out of stock. Could I cut down a 270mm steerer? It's got a 50mm butt, so I'd lose about 33mm of it. Thanks!
 02-25-11, 05:57 AM #2 mudboy Senior Member     Join Date: Sep 2008 Location: Collegeville, PA Bikes: Ruckelshaus Randonneur, Specialized Allez (early 90's, steel), Ruckelshaus Path Bomber currently being built Posts: 1,352 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) The bottom of the steerer should be entirely inside the crown. I usually leave a MM or two to clean up on the underside. 270mm would be a bit long, but you can tweak it by leaving more showing at the bottom of the crown (measure to fit, add 5-10mm that you can trim off the threaded end later, and trim the non-threaded end). 32mm is a bit low for stack height, the only ones I remember that are near that short are the old ball and race 105 and Sante units, the Ritchey Logic, and maybe a couple of Tange units if you're lucky. I usually use 40mm, which is around what the Ultegra and Dura Ace cartridge units are. Remember, it's easier to use spacers than it is to grow a longer steerer. Pete
 02-25-11, 08:53 PM #4 guywithchickens Junior Member Thread Starter   Join Date: Oct 2010 Bikes: Posts: 12 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) Great responses! Thanks for the help. Time to order fork parts...