Re: Horizontal aluminium dropouts.

Ambrose Nankivell wrote:
Unaccustomed as I am to starting threads on this newsgroup, I have an
issue that I'd like to solve.

My main steed is a town bike made around a remotely absurd oversized
aluminium frame, with a nexus seven speed hub gear, and nutted axles.

Because of my manly powerful legs, or maybe the size of sprocket I
have, I find I often have problems with the axle moving forward in the
dropouts under acceleration, or gradually edging forward, so, either
way, the chain becomes less taut.

Whenever I am assaulted by the p+nct+re fairy, I always retighten the
wheel nuts as hard as I can with the 20-odd cm spanner I use for the
job, and indeed, over time, I have probably overtightened it, as the
aluminium has been indented with the shape of the wheelnuts, and
gouged out where the axle has pulled forward on the drive side. I
also am sure that I line up the axle as close to perpendicular to the
dropouts as I can manage before tightening, and I check halfway
through.
Does anyone have any techniques or ideas for making my axle stay put?

Chain tug, as used on single speeds. Depending on the design of the
drop-out, you might have to modify/bodge a tug to work around the bracket.

DIY design for front-facing horizontal dropouts:
- Plate of aluminim, drill near front to take axle hole. Drill two holes
near rear to take M3 or M4 bolts.
- Rectangle bar of aluminium. Drill&tap to take the M3 bolts (put these in
with loctite, they don't come out again). Drill and tap at 90 degrees for M5
or M6 bolt (this bolt acts on the rear of the drop-out to limit the forwards
tug).
Might be necessary to file a small flat on curved bit of rear of drop-out to
ensure tug bolt doesn't slip round.





- Nigel

--
Nigel Cliffe,
Webmaster at http://www.2mm.org.uk/


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