Sugino 170 vs 171?
11-01-22, 04:55 PM
#1
Senior Member
Thread Starter
Sugino 170 vs 171?
Came across a Sugino DS crank today and now I have what I thought was a matched set. But a second look shows that the DS is labeled 171 and the off side is 170. Did Sugino really make cranks in 170 and 171 mm lengths at different times or did they at some point just start calling their 171 a 170 to go along with everyone else?
11-01-22, 05:10 PM
#2
Senior Member
Join Date: Feb 2013
Location: Alta California
Posts: 14,252
Mentioned: 415 Post(s)
Tagged: 1 Thread(s)
Quoted: 3807 Post(s)
Liked 3,331 Times
in
2,173 Posts
-----
yes, both made
171 earlier
used because it is a fractional equivalent (British influence)
-----
yes, both made
171 earlier
used because it is a fractional equivalent (British influence)
-----
11-02-22, 07:43 AM
#3
Old fart
Join Date: Nov 2004
Location: Appleton WI
Posts: 24,782
Bikes: Several, mostly not name brands.
Mentioned: 153 Post(s)
Tagged: 0 Thread(s)
Quoted: 3587 Post(s)
Liked 3,398 Times
in
1,932 Posts
Yes, as @juvela notes, 171mm is 6-3/4", a standard British crank arm length.
11-02-22, 08:11 AM
#4
Senior Member
Join Date: Nov 2004
Posts: 23,223
Mentioned: 654 Post(s)
Tagged: 1 Thread(s)
Quoted: 4722 Post(s)
Likes: 0
Liked 3,036 Times
in
1,874 Posts
+1, boom and pre-boom era Japanese crankarms were often labelled with the metric equivalent of the imperial size, rounded to the nearest millimetre. Common sizes included 165mm (6-1/2"), 168mm (6-5/8"), 171mm (6-3/4") and 175 mm (6-7/8"). The practice seems to have been phased out in the late 1970s, as new models/versions were introduced.
11-02-22, 09:34 AM
#5
Senior Member
Thread Starter
Thanks. So it looks like I now have DS crank that is a few sheets of copy paper longer than the NDS crank. That's not worth worrying about. However the M14 stamp on the crank is. That appears to be French thread. No wonder the crank was in a free box.
11-02-22, 09:36 AM
#6
ambulatory senior
Join Date: Dec 2016
Location: Peoria Il
Posts: 5,998
Bikes: Austro Daimler modified by Gugie! Raleigh Professional and lots of other bikes.
Mentioned: 76 Post(s)
Tagged: 0 Thread(s)
Quoted: 1955 Post(s)
Liked 3,661 Times
in
1,679 Posts
Easy retap if you want it English. Kinda cool though if you run across some French pedals.
11-02-22, 10:43 AM
#7
Senior Member
Join Date: Nov 2004
Posts: 23,223
Mentioned: 654 Post(s)
Tagged: 1 Thread(s)
Quoted: 4722 Post(s)
Likes: 0
Liked 3,036 Times
in
1,874 Posts
Install one English pedal and one French pedal. Your bicycle will be bilingual. 
Likes For T-Mar:
11-02-22, 12:09 PM
#8
Senior Member
Join Date: Oct 2015
Location: PDX
Posts: 13,034
Bikes: Merz x 5 + Specialized Merz Allez x 2, Strawberry/Newlands/DiNucci/Ti x3, Gordon, Fuso/Moulton x2, Bornstein, Paisley,1958-74 Paramounts x3, 3rensho, 74 Moto TC, 73-78 Raleigh Pro's x5, Marinoni x2, 1960 Cinelli SC, 1980 Bianchi SC, PX-10 X 2
Mentioned: 267 Post(s)
Tagged: 0 Thread(s)
Quoted: 4510 Post(s)
Liked 6,377 Times
in
3,667 Posts
Likes For merziac:
