You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The top one with 4 quadrants looks like a Miami Ohio product, perhaps for their Flying Merkel line. The hole at 3 o’clock and closer to the center looks to be the re-drill — in order to fit another manufacturer’s cranks of less proprietary dimensions. It is younger than the bottom one.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.