That may be but I thought that we were talking about their RI ride.
Well, first of all, most everyone in these groups are past the age of 22 and Singaporean. They know their way or can hail a taxi.
I'm not Singaporean but it's very rare for me to get lost and I cycle everywhere except the southwest of the island. I don't use a GPS and rely on my HP with data.
A puncture can be fixed in about 15 minutes. Bit of a surprise for me because I use Schwalbe Marathons which are extremely tough to take on and off.
Chain break can be fixed in minutes but I've only seen that happen once. I do know someone whose chain got all twisted up because he was shifting while standing on the pedals. That took about 10 minutes to rectify.
A fall, if serious, can be longer. But, if you fall down how long does it take for you to get back up? A minute?
So, you now have a 105 km ride...expectation of average speed of 20 km/hr. You have 7.5 hours to do it all in. No problem.
It's hard to touch the four corners of SG in the literal sense because in the west there are lots of areas off limits. Sure, if you want, go ahead and do 160+ kms but this is what these guys offer.