Jun 3, 2018
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For those who don't know BMX THUN is one of the strongest one pc cranks ever manufactured. They weigh in at 2pounds and 2oz.
They hold the true claim of being unbendable. They are unbendable, unless run over by a bus or something. Here is a old school Thun Crank for offering. 50.00 plus actual 2.12oz shipping weight cost. Kenton Ohio 43326
Threads are perfect. Slight rust found on any 1981 part. Came stock on Raleigh Burner, and some Mongoose's.
 

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The arm pedal throw is (6 1/2 inch) or 165.1 mm measured from center, of center shaft, to the center of pedal boss.
The over all length of the arm for ground clearance purposes measured from the center of center shaft, to the far most end of arm is (7 inch) or 177.8
pictures are high tech measuring LOL. Just to show the 6 1/2 inch and 7 inch lengths.
 

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Just to clarify they are one of the strongest one pc cranks ever made to date. Unbendable... yes they can bend just like any thing else if enough weight and abuse is placed on them. But for BMX racing they will hold a 350 pound riders jump landing weight and stay straight at a higher per cent rate than the normal Cr-Mo one pc crank. So don't get me wrong they can be bent but it is just unheard of, and very rare for a (This particular style) Thun crank, to fail under heavy load. About as strong as a 3pc Cr-Mo crank.
I think Thun still makes 3pc cranks as well to day, very good cranks, but discontinued this one pc crank years "Many Moons ago".
Let me put it to you this way. The normal one pc Cr-Mo crank is like an egg shell, the Thun one pc crank is like a coconut shell. LOL get it.
 
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