Trango
Nuts

BigBros

Craig Leubben designed the BigBro in 1984 for his Colorado State University Senior Honors Thesis in Mechanical engineering. Mountain Hardware produced the BigBro until Trango took over in 1997.

ca. 1997

Set 100-101, 552: Trango BigBros

Set 100-101, 552: Trango BigBros

↑ Set 100-101, 552: Trango BigBros

Made in Korea [ca. 1997].
BRO–1, BRO–2
The BRO-1 and BRO-2 are from about 1997. The #3 is from 2010.

100: Trango BigBro

100: Trango BigBro

100: Trango BigBro

100: Trango BigBro

↑ 100: Trango BigBro

Made in Korea [ca. 1997].
BRO01: 82–108 mm.
Medium knurl.

101: Trango BigBro

101: Trango BigBro

101: Trango BigBro

101: Trango BigBro

↑ 101: Trango BigBro

Made in Korea [ca. 1997].
BRO–2: 102–146 mm.
Fine knurl.

ca. 2003

Set 635-640: Trango BigBros

Set 635-640: Trango BigBros

↑ Set 635-640: Trango BigBros

Made in Korea [ca. 2003].
#.5–#5
Coarse knurls

635: Trango BigBro

635: Trango BigBro

635: Trango BigBro

635: Trango BigBro

↑ 635: Trango BigBro

Made in Korea [ca. 2003].
#.5: 67–83 mm.
Coarse knurl

636: Trango BigBro

636: Trango BigBro

636: Trango BigBro

636: Trango BigBro

↑ 636: Trango BigBro

Made in Korea [ca. 2003].
#1: 83–109 mm.
Coarse knurl

637: Trango BigBro

637: Trango BigBro

637: Trango BigBro

637: Trango BigBro

↑ 637: Trango BigBro

Made in Korea [ca. 2003].
#2: 103–146135 mm.
Coarse knurl

638: Trango BigBro

638: Trango BigBro

638: Trango BigBro

638: Trango BigBro

↑ 638: Trango BigBro

Made in Korea [ca. 2003].
#3: 135–205 mm.
Coarse knurl

639: Trango BigBro

639: Trango BigBro

639: Trango BigBro

639: Trango BigBro

↑ 639: Trango BigBro

Made in Korea [ca. 2003].
#4: 191–305 mm.
Coarse knurl

640: Trango BigBro

640: Trango BigBro

640: Trango BigBro

640: Trango BigBro

↑ 640: Trango BigBro

Made in Korea [ca. 2003].
#5: 285–462 mm.
Coarse knurl

2010

552: Trango BigBro

552: Trango BigBro

552: Trango BigBro

552: Trango BigBro

↑ 552: Trango BigBro

Made in Korea [2010].
#3: 133–204 mm.
Medium knurl.