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Been digging up a lot on the HT550. @mostly_by_bike has the best write up by far on it. Begins here:
https://mostlybybike.com/2018/06/01/highland-trail-550-prologue/
S_b
Group start for HT550 will be full for this year, but you can ride it any time you like* as an ITT.
*Avoid the group start period