4x 32H wheel lacing
12-07-09 | 02:49 PM
#1
Thread Starter
slow up hills
Joined: Mar 2006
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From: Seattle, WA
Bikes: Giant TCR, Redline CX, Ritchey Breakaway, Spec S-works epic
4x 32H wheel lacing
I'd love to search, but 4x isn't much of a search term.
Any word on why everyone uses 3x? If I want to go 4x (because I have spokes that work for that length), is there any mechanical reason I shouldn't.
FYI the build is a velocity aerohead w/ a powertap hub. DT 299mm spokes (more or less)
Any word on why everyone uses 3x? If I want to go 4x (because I have spokes that work for that length), is there any mechanical reason I shouldn't.
FYI the build is a velocity aerohead w/ a powertap hub. DT 299mm spokes (more or less)
12-07-09 | 03:04 PM
#2
Your mom
Joined: Aug 2006
Posts: 2,545
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No real mechanical reason, it just isn't necessary, wheel-strength wise. More crossings = more potential spoke rub, I suppose. With stiff rims and beefy enough hub flanges these days, 4x is pretty obsolete. I'm sure someone else who knows more can add to the discussion. But if I had the right length spokes, I'd do it too. Maybe not with a PowerTap, but for a knock around wheel.
12-07-09 | 03:22 PM
#3
Senior Member
Joined: Nov 2008
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From: Bay Area, Calif.
4x on a 32-spoke wheel will have the spokes leaving the hub exactly tangentially. The angle of the spoke relative to radial is calculated by dividing 360 deg. by the number of spokes on each side of the hub (16 in this case) and then multiplying by the number of crossings; so 360/16 x 4 = 90 degrees. That might be ok depending on the hub - but check that having spokes leaving at 90 degrees won't interfere where they leave the hub. 4x is commonly used on 36 or 40 hole hubs where the angle will be less than perfectly tangential 360/18 x 4 = 80 degrees for 36 hole and 360/20 x 4 = 72 degrees for 40 hole.
12-07-09 | 03:24 PM
#4
Type 1 Racer
Joined: Apr 2006
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From: Davis, CA
Bikes: A dozen or so.
I'd love to search, but 4x isn't much of a search term.
Any word on why everyone uses 3x? If I want to go 4x (because I have spokes that work for that length), is there any mechanical reason I shouldn't.
FYI the build is a velocity aerohead w/ a powertap hub. DT 299mm spokes (more or less)
Any word on why everyone uses 3x? If I want to go 4x (because I have spokes that work for that length), is there any mechanical reason I shouldn't.
FYI the build is a velocity aerohead w/ a powertap hub. DT 299mm spokes (more or less)
Not a good idea since the spokes might cross over the elbos of others, causing another bend on it's way to the rim. I'd shell out another 30-40 and get spokes for 3x... or cut your spokes down some, if possible.
12-07-09 | 04:01 PM
#7
Type 1 Racer
Joined: Apr 2006
Posts: 2,577
Likes: 0
From: Davis, CA
Bikes: A dozen or so.
4x on a 32-spoke wheel will have the spokes leaving the hub exactly tangentially. The angle of the spoke relative to radial is calculated by dividing 360 deg. by the number of spokes on each side of the hub (16 in this case) and then multiplying by the number of crossings; so 360/16 x 4 = 90 degrees. That might be ok depending on the hub - but check that having spokes leaving at 90 degrees won't interfere where they leave the hub. 4x is commonly used on 36 or 40 hole hubs where the angle will be less than perfectly tangential 360/18 x 4 = 80 degrees for 36 hole and 360/20 x 4 = 72 degrees for 40 hole.
(yes, I am a dork )
12-08-09 | 07:30 AM
#10
Senior Member
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From: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
