Author Topic: Correcting 750 front wheel offset/adjusting spokes  (Read 926 times)

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Offline my name is nobody

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Correcting 750 front wheel offset/adjusting spokes
« on: April 01, 2018, 01:59:14 PM »
I am new to re-spoking wheels, and have been practicing on some spare wheels. Seems like it goes best
when you start with all spokes showing equal threads and adjusting them until they have some tension.
From there, do the fine tuning for trueness. My question is, should wheel offset be checked last? Is it possible to adjust offset without disturbing the other settings? Guessing that this is the case, loosening spokes on one side equally and tightening spokes equally on the opposite side? Do I need a torque wrench of some sort?
I just want to be sure before I attempt this for real on my bike :P

Offline evanphi

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Re: Correcting 750 front wheel offset/adjusting spokes
« Reply #1 on: April 04, 2018, 09:12:28 AM »
If you follow any of the wheel building guides they will show you how to set up spoke tension, etc. You want all your spokes to "ring" when tapped.

I did my front wheel last winter, and it was pretty straight forward.
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1975 CB750K "Rhonda"
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Offline PeWe

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Re: Correcting 750 front wheel offset/adjusting spokes
« Reply #2 on: April 04, 2018, 10:21:08 AM »
When all spokes are mounted and nut fully tightened. Put the wheel axle in and place it on 2 jack stands and you can rotate wheel. I used a marker pen first times. Rotate wheel and let it spin, come When all spokes are mounted and nut fully tightenedoser with the marker pin until it nudge the rim. Sideways as well ass upwards. Upwards use the edge where the tire will rest.

Where the marker pen has marked, this is the stickout, Lighten tighten the spokes that will move rim to other side.You'll see that the marker hits the half of the rim.

When this is done and worst wobble is fixed continue with a dial indicator. The wobble mow might be within 2mm, continue until you see the needle moves within the 0.5 mm area. i cheated last weekend, accepted 0.6mm. The part where rim is welded will be visible when measure. Nothing to correct, the rim is not perfect. My rims have had a bump/dimple 100 mm on each side of the welded area. 100 mm on each side will get same value on the dial indicator.
This is with new rim.
Note! A new rim has horrible deburring where welded and very sharp edges on the inside against inner tube. I sanded with 240 grit paper and painted with silvergray rattle can paint (engine paint)

When wheel is trued, tighten all spokes step by step all around until they sit tight.  I did the final tightening 3 turns around.
Tools:
Screwdriver to initial tigtening of nipples
6mm block wrench tighten the nipples
Marker pen
Acetone to remove previous marker pen lines. (They will change after adjustments)
Dial indicator. (I did not use this back in the 80's, pen only until the marker line went all around the rim. Visible how it wobbles too)
« Last Edit: April 04, 2018, 10:29:45 AM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
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http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline my name is nobody

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Re: Correcting 750 front wheel offset/adjusting spokes
« Reply #3 on: April 04, 2018, 10:39:41 AM »
thanks guys. Waiting for new spokes to arrive today.

Offline bigutah

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Re: Correcting 750 front wheel offset/adjusting spokes
« Reply #4 on: April 04, 2018, 01:42:25 PM »
I am new to re-spoking wheels, and have been practicing on some spare wheels. Seems like it goes best
when you start with all spokes showing equal threads and adjusting them until they have some tension.
From there, do the fine tuning for trueness. My question is, should wheel offset be checked last? Is it possible to adjust offset without disturbing the other settings? Guessing that this is the case, loosening spokes on one side equally and tightening spokes equally on the opposite side? Do I need a torque wrench of some sort?
I just want to be sure before I attempt this for real on my bike :P
I’m a wheel smith by trade, it’s impossible to change offset with out messing with anything else. Ideally, you set it first, then true, and set spoke tension while truing, also, wire wheel on the threads with some blue lock tight never hurts. You can get a spike torque wrench from Warp9 racing that’s adjustable, look into it.


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