Am 13.03.2019 um 09:54 schrieb Andre Jute:
An even bigger problem looms on the horizon, or has already arrived according to SJS at
https://www.sjscycles.co.uk/rims-700c-29er-622/
"Rims - 700c - 622 The most common larger wheel size now, superceded the 27" (630) size"

When was the last new bike with 630 rims produced - 1975? 1985?
SJScylces still offer two rims of that size, so where's the problem?

The Kingcycle Recumbent was sold in the mid-1990's with 390 front and
541 rear wheel. The 390 front wheel can be replaced by a modern 406
fork and wheel no problem but for 541 there's no possibility of a
replacement at all...