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Arcane headset standard micro-variations...

gooseygoosey Posts: 133
edited January 2013 in MTB workshop & tech
I bought a Ritchey semi integrated headset (1 1/8 - 1 1/2 tapered) to replace the shockingly rubbish bearings in a Trek. Having knocked out the old cups I offered up the lower cup to the frame...and found it was too small. On measuring, the Trek original had an external diameter of 56mm and the Ritchey was 55mm. Fortunately the cartridge bearing fitted ok into the old cup so all was not lost.
But - what did I overlook here? Help me prevent similar mistakes in the future!

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