Here's the tool you need to measure rim thickness. I bought one of these about a year ago and have used it on a dozen wheels already. Anything above 0.75mm is fine in the older rims. Some of the newer lightweights start off even thinner than this!
http://www.ebay.co.uk/itm/Prestige-spring-measuring-caliper-jewellers-gem-stone-bead-diamonds-15mm-New-/330616452190
@benbrangwyn started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Here's the tool you need to measure rim thickness. I bought one of these about a year ago and have used it on a dozen wheels already. Anything above 0.75mm is fine in the older rims. Some of the newer lightweights start off even thinner than this!
http://www.ebay.co.uk/itm/Prestige-spring-measuring-caliper-jewellers-gem-stone-bead-diamonds-15mm-New-/330616452190