---
title: Introduction of Zinn integrated-spindle custom-length cranks
description: Introduction of Zinn integrated-spindle custom-length cranks
image: https://blog.zinn.bike/hubfs/Imported_Blog_Media/crank-ZIS-CMYK-scaled.jpg
---
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# Introduction of Zinn integrated-spindle custom-length cranks
TECHNICAL GUIDE
# Introduction of Zinn integrated-spindle custom-length cranks
1 min read
Jun 14, 2008
Lennard Zinn
[Timeline](https://blog.zinn.bike/tag/timeline)
Jun 13, 2008, 10:21:15 PM
[Lennard Zinn](https://blog.zinn.bike/author/lennardzinn)
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The first Zinn integrated-spindle (“Zinn-tegrated”, or ZIS) cranks come out of the CNC machine and onto the bikes of tall riders. They are available in lengths from 190mm to 220mm. We had been selling custom cranks for square-taper bottom brackets since 2002 in sizes from 100mm to 250mm; the integrated spindle was much stiffer in the long lengths.
[Timeline](https://blog.zinn.bike/tag/timeline)
LE
##### Written by Lennard Zinn
As a frame builder, Lennard Zinn has been designing and building custom bicycles for over 42 years; he founded [Zinn Cycles](https://zinncycles.com/) in 1982 and co-founded [Clydesdale Bicycles](https://bikeclydesdale.com/) in 2017. His [Tech Q&A column on Substack](https://lennardzinn.substack.com/) follows his 35-year stint as a [technical writer for VeloNews](https://velo.outsideonline.com/byline/lennard-zinn/) (from 1987 through 2022). He is a former U.S. National Cycling Team member and author of many bicycle books including [Zinn and the Art of Mountain Bike Maintenance](https://www.bigandtallbike.com/copy-of-zinn-the-art-of-mountain-bike-maintenance.html), [Zinn and the Art of Road Bike Maintenance](https://www.bigandtallbike.com/copy-of-zinn-the-art-of-road-bike-maintenance-5th.html), and [The Haywire Heart](https://www.bigandtallbike.com/the-haywire-heart-paperback.html). He holds a bachelor’s degree in physics from Colorado College.
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