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t120 wheel lacing-offset #147540
08/25/08 8:53 pm
08/25/08 8:53 pm
Joined: Oct 2006
Posts: 2
San Antonio, TX
M
MichaelT120 Offline OP
BritBike Forum member
MichaelT120  Offline OP
BritBike Forum member
M
Joined: Oct 2006
Posts: 2
San Antonio, TX
Dear Friends,
I'm lacing a set of flanged alloys (WM2x19" and WM3x18")to a standard rear hub and to a front tls drum( 1968 t120.)
I followed a guide published on a 1998 Vintage Bike in lacing the rear wheel (worked wonderfully) but I am stumped at the apparent discrepancy between the article and the shop manual concerning the offset: the manual lists 1.75" from hub to rim while the article lists 0.5".
The manual also lists -1/64 for the front, while measuring the offset for what seems an original front drum-Dunlop WM-2 gives ~1/8 (+)
Please Advise.
Thank You,
Michael


1968 T120
1996 M900
1972 YDS-7
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Re: t120 wheel lacing-offset #147541
08/25/08 9:40 pm
08/25/08 9:40 pm
Joined: Apr 2004
Posts: 89
Front Royal, VA
J
John M Offline
BritBike Forum member
John M  Offline
BritBike Forum member
J
Joined: Apr 2004
Posts: 89
Front Royal, VA
Michael,

When I laced up my wheels, I too was baffled by the offset figures in the manual. What I did was to roughly build the front wheel, then mount it on the bike and center it between the forks and true it exactly. Then I built the rear wheel, mounted it on the bike, and brought it into line with the front wheel. This can be done by lightly strapping two long fluorescent bulbs (or other straightedges such as angle iron) to the rear wheel with bungee cords so that they pass on either side of the front wheel. This takes work, of course, but I think the boys at Meriden were eager to get off to the pub when they wrote the section on wheel offsets. I have had no problems with this setup in many thousands of miles, and the sprockets seem to line up exactly. If anyone knows better, let us know!

Hope this helps,

John
1969 Bonneville


latin81@comcast.net
Re: t120 wheel lacing-offset #147542
08/26/08 2:24 am
08/26/08 2:24 am
Joined: Oct 2003
Posts: 11,247
North Georgia, USA
RF Whatley Online content
BritBike Forum member
RF Whatley  Online Content
BritBike Forum member
Joined: Oct 2003
Posts: 11,247
North Georgia, USA
Front rim centered.
Rear brake drum surface to the wheel center = 89mm.
You heard it here first.

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: t120 wheel lacing-offset #147543
08/26/08 12:13 pm
08/26/08 12:13 pm
Joined: Mar 2005
Posts: 10,172
Boston, Massachusetts
J
John Healy Online content

BritBike Forum member
John Healy  Online Content

BritBike Forum member
J
Joined: Mar 2005
Posts: 10,172
Boston, Massachusetts
The measurement in the Vintage Bike article uses the wheel hub's brake drum flange while the factory service manual uses the outer face of the brake drum.

Most of the time when I lace one of these wheels I do not have the brake drum at hand. So instead of tracking down a brake drum I use the hub's brake drum flange for reference.
John


Re: t120 wheel lacing-offset [Re: MichaelT120] #458523
10/12/12 5:49 pm
10/12/12 5:49 pm
Joined: Jul 2010
Posts: 9
MA,USA
R
Ratfink56 Offline
BritBike Forum member
Ratfink56  Offline
BritBike Forum member
R
Joined: Jul 2010
Posts: 9
MA,USA
I am lacing my first wheel. I have the 19" WM2 Front. The wheel is CWC and the spoke kit is from Buchanan. On the drum side they are 4 3/4 spokes. 10 are on the inside and 10 on the outside.The other 20 straight ones go on the other side as I am sure you know. My question is: Does the wheel have to be flipped a certain way or can you start on either side? On the drum side I put the correct spokes on the outside(The 90 degree hook) and inside(A little more radical hook) as directed by Buchanan but the drum edge is recessed quite a bit from the wheel.It looks way off center. All the spokes fit in naturally with a struggle so I am sure I have the right nipple holes plus I had a few pictures from The Triumph Jockey Journal. Do I need o flip the wheel over and start lacing from the other side? Any help would be appreciated.


Moderated by  John Healy 


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