Derek, if you can do hTn then you’ll be able to do the Mcr 100 – there are a few snap climbs around the back of northwich, and at the end there is a bit where you go through a steep cut on the way back through Wythenshawe but nothing is more than a couple of hundred yards of 7%
if you do it on a mountain bike then slicks would be a good idea… 7 hours would give you time for stops and mechanicals
car parking is a nightmare in Withy park so get there early or park nearby and ride in/out
I think chaingangs is overstating it a bit, people sometimes form groups and share turns on the front because it can be windy especially round by nantwich where it’s flat and lots of cropfields