I've been watching some videos on YouTube and overheard a guy talking on his phone at Mt Lofty, it turns out that people are hitting max speeds of over 80kmph down Greenhill Rd.
I am 6ft 5 so I'm not the most aerodynamic but I don't even get to 70.
Does anyone get to speeds this high? If so how/where do you do it???
I do not promote fast descents, as they can be very dangerous, however the decent into Snake Gully on the One Tree Hill road is very fast, and I often achieve 85km/h. You have to pay for it though, as there is a super little climb back out of the gully.
Agree not a straight bit of road so you have to be very very attentive, wouldn't suggest riding along that road during sunrise as cars would struggle to see you on some corners as you climb back out, but the climb is deceiving though. The speed down is awesome, I've had some young lads give me the thumbs up as they pass just over the narrow bridge
I guess knowledge of the road is a big key. I live up in Mt Barker so I don't get to ride on the road that often.
Watch out for vehicles on Greenhill Road! I would set my records on quieter roads.
52:12 gearing (albeit on 26 x 1 3/8 wheels), pedalling, leaning the bike right over in the corners much as a motorcyclist does. (Easier with toe-clips and straps than with cleats, I suspect). And this on an "upright" bike. (Not recently, though.) Dry road.
The best part for high speed is the section between Summit Rd and Yarrabee Rd. On this section, you have the face of the cutting to your left, rather than the edge of the world, and some of the bends have been eased.
Some of it's about getting really aero, some is knowing when not to hit the breaks, and some is picking the right line - you can lose a lot of speed around the corners without even breaking if you take them wrong.
I have seen a lot of people fight the bike on descents this can slow you down a lot.
If you are using a non GPS computer they can be calibrated poorly and read wrong.
Of course people would never exaggerate.
Knowing the road would help.
Of course you don't really know that you are going too fast until you have strife.
How many crashes are you prepared to have to find out how fast is too fast?
A head on with a car has the capacity to ruin your ride.
Yep, don't base your descent speeds on your riding buddies descent speeds. They might know the road better than you, or just be more aero than you, and trying to keep up can hurt a lot when you try to make the bike go in directions it doesn't want to go.
Ride the road a couple of times, try to learn the good lines, then start pushing it, if you're comfortable. The fastest part on Greenhill is after the S bend.
My quickest down there was 79km/h and I did that between Hallet Rd and the roundabout. Dead straight. I take it easy on the rest of way down getting to about 60km/h max. Knowing the road definitely helps. Take Fox Creek for example. There is a left hander after the hairpin. Ive gotten to 85km/hr by going easy into it and then acellerating hard out of it. I learned this by going too fast into this cnr and having to brake and losing all my momentum. The only times Ive gone as quick or quicker are 89.9 on new Willunga Hill being buffeted by the wind, 87.3 back in the old days pre tunnels coming down the old freeway between Devils Elbow and the Mt Osmond bridge and 85 on Flagstaff Hill Rd just before 2 lanes become 1. As you can proberly tell by the above I do my max speeds on straightish roads. Another thing that helps to go fast is good wheel bearings.