Adjusting non-adjustable dropouts

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IceCyclist
Posts: 8
Joined: 26 Feb 2017, 12:50pm

Adjusting non-adjustable dropouts

Postby IceCyclist » 5 Apr 2017, 1:51pm

Is there any way to retrofit a dropout adjuster to non-adjustable dropouts? Or, alternatively, is it possible to buy shims of varying sizes which can be affixed in the dropout to achieve the same effect?

Any advice gratefully received!

Threevok
Posts: 195
Joined: 30 Sep 2016, 3:11pm

Re: Adjusting non-adjustable dropouts

Postby Threevok » 5 Apr 2017, 3:24pm

Not sure - It would greatly depend on what frame it is.

Are you planning a Single Speed / Fixed conversion ?

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andrew_s
Posts: 4946
Joined: 7 Jan 2007, 9:29pm
Location: Gloucestershire

Re: Adjusting non-adjustable dropouts

Postby andrew_s » 5 Apr 2017, 3:29pm

If you mean the adjusting screw that's in some horizontal dropouts, there are various types of adjuster available, such as the Surly Tuggnut or DMR chain tugs.

On the other hand if you have vertical dropouts, it would be new frame time (or at least take the frame to a framebuilder), and a request for sliding or rocker dropouts

rjb
Posts: 3448
Joined: 11 Jan 2007, 10:25am
Location: Somerset (originally 60/70's Plymouth)

Re: Adjusting non-adjustable dropouts

Postby rjb » 5 Apr 2017, 4:57pm

Like these, not sure where you would get them nowadays. I've got some similar nylon ones somewhere from a 1970's raleigh, they had a worm screw and a thumbwheel to screw the worm in and out. had a quick look but couldn't locate them.

Image

you could try a diy solution like a short nut and bolt and a couple of washers, fit behind the hub so the axle locknuts but up against them. :wink:
At the last count:- Focus Variado, Peugeot 531 pro, Dawes Discovery Tandem, Dawes Kingpin, Raleigh 20, Falcon K2 MTB dropped bar tourer, Longstaff trike conversion on a Falcon corsa. :D

rjb
Posts: 3448
Joined: 11 Jan 2007, 10:25am
Location: Somerset (originally 60/70's Plymouth)

Re: Adjusting non-adjustable dropouts

Postby rjb » 6 Apr 2017, 4:28pm

Found one. They just locate in the dropout. :wink:

image.jpg
Dropout adjuster
At the last count:- Focus Variado, Peugeot 531 pro, Dawes Discovery Tandem, Dawes Kingpin, Raleigh 20, Falcon K2 MTB dropped bar tourer, Longstaff trike conversion on a Falcon corsa. :D

IceCyclist
Posts: 8
Joined: 26 Feb 2017, 12:50pm

Re: Adjusting non-adjustable dropouts

Postby IceCyclist » 25 Apr 2017, 5:07pm

The frame is a Dawes Horizon Twin - but I'm concerned that the drag brake (an Arai Drum) is going drag needlessly without a little fettling. And a dropout adjustment is just the fettling it needs.

Brucey
Posts: 35843
Joined: 4 Jan 2012, 6:25pm

Re: Adjusting non-adjustable dropouts

Postby Brucey » 25 Apr 2017, 9:32pm

IceCyclist wrote:The frame is a Dawes Horizon Twin - but I'm concerned that the drag brake (an Arai Drum) is going drag needlessly without a little fettling. And a dropout adjustment is just the fettling it needs.


I am not quite sure what your logic is there; the brake doesn't exert an especially large torque that would tend to move the wheel in the dropout, so once it is in the right place it ought to stay there, unless the track nut isn't tight enough.

Usually the wheel movement that is most likely to occur (with near-horizontal dropouts on a tandem) is that the RH side of the axle tries to slide forwards in the dropout when you are using low gears. You don't need much of this before the tyre is rubbing on the chainstays....

However if the reaction arm is forced sideways where it is mounted on the chainstay, that can cause the drum brake to rub. It is usually a question of using spacers on the chainstay mounting or (with care) putting a 'set' into the reaction arm.

Note also that if the wheel pulls forward on the RHS the brake reaction arm will be pushed sideways and this may cause a brake rub. So be careful not to associate the wrong things as cause and effect.

cheers
-------------------------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

Threevok
Posts: 195
Joined: 30 Sep 2016, 3:11pm

Re: Adjusting non-adjustable dropouts

Postby Threevok » 26 Apr 2017, 11:46am

rjb wrote:Found one. They just locate in the dropout. :wink:

image.jpg


I like the look of those - do you know where I can get some ?

IceCyclist
Posts: 8
Joined: 26 Feb 2017, 12:50pm

Re: Adjusting non-adjustable dropouts

Postby IceCyclist » 8 May 2017, 4:49pm

Thanks Brucey - I'm sure that you're right. I'm probably being over cautious. Nevertheless, the devices found by rjb look ideal - I'd very much like to buy some!