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I've made the doc editable by anyone now, so if you find others bars or additional data, please add them to the googlesheet. Howard - I have added your items in, thanks.
William, most of the ones listed originally I believe have 25.4 to 26.0 clamp areas. I'll add them to the sheet. FYI, Sheldon's cribsheet is useful here.
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The list is in the attached graphic. Might help someone...
Plz add any further data via comments to this googledoc
Cheers. Ben.
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I use one of these: http://www.ebay.co.uk/itm/proops-Deuxieme-Gauge-bicycle-rim-gauge-0-72mm-bike-rims-measure-tool-/111647317689 to measure rim thickness. My recollection is that anything below 0.75 of a mm is dodgy (though I believe some of the very light rims are constructed with 0.75mm as standard!). Just checked, and Jobst Brandt took some of his rims to 0.5mm and wouldn't recommend it (http://yarchive.net/bike/rim_wear.html).
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http://www.marktplaats.nl/z/fietsen-en-brommers/fietsen-racefietsen/gazelle-heren-gazelle-staal-titanium-61-tot-65-cm.html?query=gazelle&categoryId=464&sortBy=SortIndex&attributes=S%2C3519&attributes=S%2C3494&attributes=S%2C3517&attributes=S%2C3586&attributes=S%2C11379&attributes=S%2C11380&startDateFrom=always. I recently got a glorious 62cm Gazelle on this site for an extremely good price. The frame is stunningly well put together.
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There may be an extra ball in there or the wrong size balls. Or one of them is the wrong size. Actually, that first suggestion sounds ridiculous, so I'll withdraw it.
If you want to check the headset on a normal bike, you do it by rocking the front with the front brake on. On a track frame, you gotta turn the bars 90 degrees and then rock the front.
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The slippage is almost always on the cogs at the rear rather than at the front. The front can get really worn before slipping. It's always a bit misleading because it's so difficult to actually SEE the wear on the rear cogs. Usually, it's the smallest cog on the rear that slips first because it gets worn fastest (having the fewest teeth). You don't tell us how many cogs you have on the rear - however, if you've spent most of your time in this 5th gear, that could be much more worn than the others. You could switch the cassette at the rear, but you may find it slips even worse because your chain is too worn. Get a chain checker and measure it yourself (everyone should have a chain checker, they're cheap and pay for themselves very quickly).
Frame size is usually stamped on the bottom of the brake bridge (or seatstay bridge in this case).