The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: AWJD on 24.07. 2015 12:18
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My 1961 A10 has a 8" cast hub on the front and a 7" cast hub on the rear. I'm about to re-build the wheels but can't find where I wrote down the offset data. I suspect this might be because I didn't write it down because the rims are centred on the hubs; ie the rims have the same offset on both sides relative to the spoke holes in the bub.
I would be grateful if someone could confirm this for me. I don't really want to assemble both wheels and then try them in the frame because this would then mean taking them all apart again since I can't re-built them on my jig with the wheel axles in place.
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no offset as far as know, but (there's always a but) when I put my front wheel in it was not central to the forks, however it took only a half turn on the spokes (in one side out the other side) to correct it so no need to remove the wheel in my case, you will know how close the spoke ends were to the top of the nipples when you spoked the wheel.
In the bigger picture I doubt actually that I would have had a great deal of trouble had I left the wheel as was, we are I think a bit more particular than we/they were back in the day.
Now someone I just know is going to tell me it wouldn't have gone round corners ;)
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Thanks for that reassurance - I'll rebuild the wheels with a symmetrical offset ( I think the hub is 3" wide and the rim is 2.75"). In the past, I've only adjusted the offset on the bike if the front wheel is obviously offset to one side or the rear wheel is getting too close to the chain guard.
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Don't want to cause any confusion but I looked on the following link for offset and added comments, there is a difference as my 1961 A7 has a 7 inch front break but I ended up with a 5mm offset.
See http://www.a7a10.net/forum/index.php?topic=4368.0 (http://www.a7a10.net/forum/index.php?topic=4368.0)
I think the central in forks rule is the key
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I read the previous posts before I started this thread. However, in the case of my A10, I believe I must have measured the offsets before removing the hubs and found the rim was central and then assumed I would remember this when I came to re-build them. Normally, I write down what the measurements are. I also checked earlier with Central Wheel Components who confirmed their data base shows the rim to be central.
After I've re-built the wheels and re-fitted them to the bike, I'll confirm what the results were and whether I had to adjust the offset afterwards.
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My experience is like Bill's, I had to "tweak" the front wheel to centralise in the forks on reassy, again about 1/2 turn...the rear wheel has been much more problematic because (after frame straightening too!) I have had to "balance" centralising in the swing arm with front/rear alignment...and if I look at how well the swing arm is "centralised" (or not) in the rear frame "legs", well.... *sad2*
I actually think that we try to be too pedantic sometimes based on our modern expectations, certainly thats my problem I know *eek*