or from UK http://www.ebay.co.uk/itm/Vittoria-Juniores-Road-Bike-24-TUBULAR-Tyre-600-x-21-/360459776744?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item53ed13b2e8
But I didn't post a link 'cause I ain't sure about the size. I've two Vittoria tubs on my 24's so I guess that's right size.
@Jere started
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or from UK http://www.ebay.co.uk/itm/Vittoria-Juniores-Road-Bike-24-TUBULAR-Tyre-600-x-21-/360459776744?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item53ed13b2e8
But I didn't post a link 'cause I ain't sure about the size. I've two Vittoria tubs on my 24's so I guess that's right size.