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Leshaches
snottyotter
@hippy
Ok, so that bearing code should be for 17x30x7mm bearings:
https://simplybearings.co.uk/shop/p55072/W619032RSR-Quality-Budget-Stainless-Steel-Rubber-Sealed-Thin-Section-Deep-Groove-Ball-Bearing-17x30x7mm/product_info.html
But my calipers measure ~17.5mm internal and Simply Bearings suggest - If your bearing has the code 6903/61903 on the races and/or seals but has an 18mm bore, then you may need a [MR183072RS] which would be one of these:
https://simplybearings.co.uk/shop/p185962/ENDURO-MR183072RS-Rubber-Sealed-Deep-Groove-Ball-Bearing-18x30x7mm/product_info.html
What would Jesus do?
This is what Jesus would do:
https://simplybearings.co.uk/shop/p6243/SKF-619032RS1-Rubber-Sealed-Thin-Section-Deep-Groove-Ball-Bearing-17x30x7mm/product_info.html
Then again, my LBS charge £25 for a front wheel hub service which seems to include bearing "hub will be dismantled and cleaned along with the cone nuts and axle. Bearings will be cleaned or replaced. The hub will be reassembled with fresh grease." so it does make me wonder why I would bother doing it myself, given it'll cost me £35 in bearings, other than the fact it's half done, I just don't have the right bearings for it.
Cheaper bearings?