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 Post subject: Retro crank for commuter
PostPosted: Mon May 13, 2019 5:35 pm 
Devout Dirtbag

Joined: Sat Apr 07, 2012 1:23 pm
Posts: 112
Built myself a bike on this same frame https://www.flickr.com/photos/paste/2692629464 (not my flickr).

Quite perfect for commuting with its mid-range brakes making room for fenders. Only missing a crank at this point. I'm running 1x10 with a downtube shifter, my commute is quite flat, but often pulling kids in a trailer etc.

175mm length mandatory.

First preference would be a fluted pista crank but they are few and far between, especially at 175mm. Also quite dear.
Second choice a fluted 2x crank like the IRD Defiant I can run with a shorter BB to get a reasonable chainline.
Or if nothing work, I'll take any silver crank that fits halfway, it's only commuting after all (still the bike I ride the most so i'm quite keen on it).

In case I find a pista one, are there 144bcd chainrings for 10x chains available? Haven't found anything obvious.

But anyway maybe I should just use Surly Steel rings, wore out 2 rings last winter. That would rule out 144bcd.

So many options. Any recommendations?

Thanks.


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 Post subject: Re:
PostPosted: Mon May 13, 2019 6:08 pm 
Gold Trader
Gold Trader
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Joined: Fri Aug 20, 2010 11:28 am
Posts: 7381
Location: Gorleston-on-sea (If there is a bright center to the universe this is place furthest from it
TA make 10 speed chainrings in 144 bcd :wink:

I have a Silstar crank that fits the fluted criteria :wink:

But alas only 170mm :(


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PostPosted: Mon May 13, 2019 6:32 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9400
Location: New Forest, UK
Most NW rings seem to be 110pcd for standard 5x drillings. I would also favour square taper BB as they still last longer - important on a commuter
IIRC Velo Orange do a repro crank in 110, also there are some old Suginos like that. Failing that I'd buy an MTB 110 pcd crank (say old M730, M650 or M550) and polish it up.


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 Post subject: Re:
PostPosted: Tue May 14, 2019 12:15 pm 
Devout Dirtbag

Joined: Sat Apr 07, 2012 1:23 pm
Posts: 112
@hamster yup, square taper for sure, anyway seems to be what all the vintage cranks are using, and lends itself nicely to chainline tweaks when using a 2x crankset in 1x mode.

This brings me to another question. Is it possible to use an "inner" chainring in the outer position for a 1x setup? Don't need the top-end gear for commuting, prefer lower ratio for hauling, but would prefer outer position for aesthetic reasons.


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PostPosted: Tue May 14, 2019 8:32 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9400
Location: New Forest, UK
I have never had any problem - the lack of the shallow counterbore for the head of the bolt never seems to be a problem for me - as you say, adjusting the BB length allows chainline tweaking. I'm currently running a Superstar NW 110 ring exactly like that on a Middleburn crank with 103mm BB on my singlespeed. It;s run all winter and hasn't loosened.


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 Post subject: Re:
PostPosted: Wed May 15, 2019 9:17 am 
Devout Dirtbag

Joined: Sat Apr 07, 2012 1:23 pm
Posts: 112
Thanks again.
Found a Campy Super Record crankset at a quite good price (mid double figures).

Anyone know off hand if this is JIS or ISO taper?

Attachment:
csr.png
csr.png [ 455.54 KiB | Viewed 113 times ]


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PostPosted: Wed May 15, 2019 1:31 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9400
Location: New Forest, UK
They are neither and both taper! At that age they were before standardisation but for something somewhat in between. Probably the amount of distortion they have suffered is the deciding factor. Try them on Shimano and see if they go a decent way onto the taper. The taper angle is the same on all of them as far as I know.


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