Author Topic: Cb400F2 Front wheel alignment sorted and "hello"  (Read 874 times)

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Offline Splash-Milkey

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Cb400F2 Front wheel alignment sorted and "hello"
« on: November 23, 2011, 12:06:26 PM »
I've been lurking around in the shadows on here for a while, but this is my first post, so a quick ‘ello, and a thank you to all the contributors.

As the title of the thread suggests, I've just sorted my front end issue, and I wanted to share the story.

So, bought the bike a while ago, and I have been busy chipping the araldite and bathroom sealant off that was holding it together (not joking) and generally tweaking it to my liking...

Come to mod the front mudguard and noticed that the wheel was sitting about 5mm offset to the right as you look at the front of the bike (too near the disc side fork). It was very noticeable where the tyre is nearest the top of the fork legs. The tyre was nearly rubbing on the mudguard bracket. Mmmm, that’s not right, let’s have a little look at that….

Well, after checking and rechecking I decided everything was correct.

I removed the front end. I followed advice from various threads on here, and everything was taken apart and seemed to measure up perfectly. Everything was the correct length, the correct size, and fitted correctly. Yup, it’s all correct.

I suspended the front end from the roof, dropping plumb lines, measuring fork offsets, spacers, my own patience, and staring suspiciously firstly at the yokes, then the fork lowers, the speedo assembly, and finally eyeing myself with suspicion, I was stumped. The wheels and forks were perfectly true to vertical and each other, everything that I had measured 12 times before had not grown or shrunk. The wheel was true, the axle true, the forks true, the yokes true. Everything was definitely bob on, everything of course, apart from the fact the wheel was pissed in the forks.

Well, I’ll save you the guessing game.

Some bugger has laced the wheel with a 6mm offset.

I’m off for a beer…..

Thanks again,
Dave
« Last Edit: November 23, 2011, 12:14:18 PM by Splash-Milkey »

Offline Splash-Milkey

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Re: Front wheel alignment sorted and "hello"
« Reply #1 on: November 23, 2011, 12:11:38 PM »
The source of the pain...

Offline camelman

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Re: Cb400F2 Front wheel alignment sorted and "hello"
« Reply #2 on: November 23, 2011, 12:49:32 PM »
Welcome, and thanks for the great story.  I really don't know much about wheel lacing, but either it is supposed to be offset... or someone really buggered it up.  Enjoy the beer.  You deserve it.

Camelman
1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline Splash-Milkey

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Re: Cb400F2 Front wheel alignment sorted and "hello"
« Reply #3 on: November 23, 2011, 02:08:10 PM »
Thanks Camelman,

I'm really hoping someone doesn't pipe in that a 6mm offest is correct, as i have started to disassemble my hanging gardens of babylon.

I've googled furiously, but haven't been able to definitively find a statement that proves that the 400/4 has a zero offset front wheel, but the hub is dead centre between the forks, so my now beer addled brain is telling me that if the rim is zero offset to the hub, I've got myself a front tyre that will sit in the middle.
Cheers!
Dave

Offline kyre

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Re: Cb400F2 Front wheel alignment sorted and "hello"
« Reply #4 on: November 23, 2011, 02:55:51 PM »
No offset on the front wheel.
CB400F / 466 Build Thread (currently in progress)
http://forums.sohc4.net/index.php?topic=105027.0