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#325358 - 07/29/10 2:49 pm Wheel offset from frame?  
Joined: Oct 2005
Posts: 198
beans n toast Offline
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beans n toast  Offline
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Toronto
This is going to possibly be the dumbest question ever!

OK, once I get my rear sprocket to line up with the gearbox sprocket on the pre-unit, and the wheel sits nicely in the swingarm, the wheel is offset from the centreline of the frame by almost an inch to the drum side!

This is not normal, and might surely kill me, right?

Are there any tips to how to rectify?


1957 T110
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#325369 - 07/29/10 3:43 pm Re: Wheel offset from frame? [Re: beans n toast]  
Joined: Mar 2005
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John Healy Online content
John Healy  Online Content



Joined: Mar 2005
Posts: 9,971
Boston, Massachusetts
Main (front) frame or rear frame?


#325371 - 07/29/10 3:59 pm Re: Wheel offset from frame? [Re: John Healy]  
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beans n toast Offline
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beans n toast  Offline
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Toronto
The front.


1957 T110
#325382 - 07/29/10 5:17 pm Re: Wheel offset from frame? [Re: beans n toast]  
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Jersey Kev Offline
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Jersey Kev  Offline
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new jersey, usa
Don't know if this will help, but I had a similar problem with my '76 T140V Bonnie. I know, completely different bike but, I had a seriously offset rear tire, so close to the sprocket was the tire that I couldn't hardly fit a matchbook between the chain & tire, let alone a chainguard. I finally discovered after installing a newer rim and stainless steel spokes, that a PO had laced the wheel backwards. How do I know it was he, and not me? I replaced spoke for spoke, one at a time (due to 4 different sizes). Well, when I (thought I) was done, the chain wouldn't fit at all. Only then did it dawn on me that it was backward from the start. I got it sorted out, and now there is sufficient clearence for the chain, and I now have a chainguard to boot. Oh, I was also able to remove a "shim" washer on the rear caliper which was needed in order to make that work. The tire still looks kind of offset, but at least it work better now. Maybe someday I'll get it figured out completely.
Hope this helps,
Jersey Kev


Jersey Kev

67 TR6P Saint
76 T140V Bonneville
95 Daytona 900
(removed non-brit from list)
#325389 - 07/29/10 6:01 pm Re: Wheel offset from frame? [Re: Jersey Kev]  
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beans n toast Offline
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beans n toast  Offline
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Thanks Kev,

My issue isn't so much clearance. Everything lines up great, (brake stay, sprockets, etc.. and the tire fits great in the swingarm...

But when I look at the tire, it doesn't fall directly in line with the centre of the front frame section. It's about an inch to the left (sprocket side) when I'm looking at it from the rear.

I imagine this would cause all sorts of handling problems, especially at higher speeds?

Unless this is one of those quirky pre-unit things?


1957 T110
#325396 - 07/29/10 6:20 pm Re: Wheel offset from frame? [Re: beans n toast]  
Joined: Mar 2005
Posts: 9,971
John Healy Online content
John Healy  Online Content



Joined: Mar 2005
Posts: 9,971
Boston, Massachusetts
1954 to 1960 Triumph twins 2 9/16"

This offset dimension is given from the center of the rim to the furthest hub projection OPPOSITE the brake drum side.

This is taken from the Western Triumph and Ariel Motorcycle Dealers Supplemental Information Booklet put out by Johnson Motors. January 1960


#325418 - 07/29/10 8:37 pm Re: Wheel offset from frame? [Re: John Healy]  
Joined: Oct 2005
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beans n toast Offline
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beans n toast  Offline
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Toronto
Thanks John,

I'll measure when I get home.

But I'm right to think the rear wheel should align centered to the backbone of the frame and the front wheel?


1957 T110
#325434 - 07/29/10 9:48 pm Re: Wheel offset from frame? [Re: beans n toast]  
Joined: Sep 2007
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tonupjonnie Offline
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tonupjonnie  Offline
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Los Angeles
Here is a shot of a 1957 TR6 Iam currently restoring showing the wheel centered, this frame and subfram were both in need of straightening after some rough years in the So Cal Desert.
Jonnie.

#325472 - 07/30/10 2:16 am Re: Wheel offset from frame? [Re: tonupjonnie]  
Joined: Mar 2005
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John Healy Online content
John Healy  Online Content



Joined: Mar 2005
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Boston, Massachusetts
Johnie: What's your offset as compared to the figures given by Johnson Motors?

I often find the "book" figures don't jive with the those taken from the bike itself.

John


#325492 - 07/30/10 3:58 am Re: Wheel offset from frame? [Re: beans n toast]  
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Pete R - R.I.P. Offline
In Remembrance
Pete R - R.I.P.  Offline
In Remembrance

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Vic. Australia
I don't know why people insist on using some part of the hub (which may or may not be in its ideal position) as a reference point for wheel-building.

If you have a Triumph 500/650/750 unit or pre-unit and its built with standard parts,the centreline of the gearbox sprocket and chain is 3" from the frame centreline.
So if the centreline of the rear sprocket is 3" from the rim centreline,a 1950 Speed Twin would be happy with that.If the chain is aligned ,the wheel will be centred in the frame.

Because unit engines are noticably heavier on the primary side (with alternator,duplex/triplex chain,and a heavier clutch),I shorten that centre to centre distance to 2-15/16".
The chain stays aligned and the rim moves slightly toward the weight centre (primary side).
This keeps a unit happy.

#325494 - 07/30/10 4:42 am Re: Wheel offset from frame? [Re: Pete R - R.I.P.]  
Joined: Sep 2007
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tonupjonnie Offline
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tonupjonnie  Offline
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Los Angeles
Funny you should say that John, I have that Wheel Lacing Info up on my blog, as you suggest it give 2-9/16 as the correct measurement when in reality it needed to be set at 2-1/4, at this measurement the Rim is perfectly centered, here is that chart that I should probably remove from the blog if not amend it.

[email:http://tonupclassics.blogspot.com/]http://tonupclassics.blogspot.com/[/email]

#325547 - 07/30/10 2:20 pm Re: Wheel offset from frame? [Re: tonupjonnie]  
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beans n toast Offline
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beans n toast  Offline
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Well, something's not right then. Sprockets line up, wheel is not centered to the frame.

I hope it's not the frame being bent, but just the wrong wheel.

I'm gonna take it to my mechanic tomorrow, and he will probably call me a moron and an idiot and yell at me... then I will pay him for the pleasure.


1957 T110
#325612 - 07/30/10 9:03 pm Re: Wheel offset from frame? [Re: beans n toast]  
Joined: Sep 2007
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Roadwarrior Offline
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Beans, can you post a picture?


Bob


73 Triumph T140 Main Ride
70 Bonnie
67 BSA West Coast Hornet

56 Chevy

Who are the brain police?



#325956 - 08/01/10 10:10 pm Re: Wheel offset from frame? [Re: Roadwarrior]  
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beans n toast Offline
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beans n toast  Offline
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Well, gents, looks to be a bent swingarm. frown

Anyone have a straight pre-unit swingarm for a 57 t110?

b


1957 T110
#326032 - 08/02/10 10:21 am Re: Wheel offset from frame? [Re: beans n toast]  
Joined: Jul 2009
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Pete R - R.I.P. Offline
In Remembrance
Pete R - R.I.P.  Offline
In Remembrance

Joined: Jul 2009
Posts: 3,549
Vic. Australia
If you decide to press it straight,put some neat-fitting pieces of solid shaft into the bushes to stop that area being squashed out-of-round.
If you're straightening it,over-bend it first to destroy it's memory;then press it back a little to the final straight position.


Moderated by  John Healy 


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