Scary moment on ride yesterday

[deluz]

I am just starting to get into longer and hillier rides after a year off due to health problems. Yesterday I did a moderately hilly ride (1900 ft) that I have done probably a hundred times before. One section of the ride has a long twisty descent through a canyon that can get pretty windy. It is a narrow road with high speed car traffic. Yesterday the wind was gusting and part way down the front wheel started oscillating back and forth and I had to put on the brakes.
I was riding my new Tarmac SL8 with 40mm BTLOS wheels. On previous rides I had noticed the wheels catching the wind but nothing serious like this.
The rims are GX40 22mm internal width and thought this shape rim is supposed to be less subject to catching the wind.
I am not wanting to change wheels and decided not to ride this road anymore since I am 67 and wanting to have less risk as a crash could be disaster.

[mass_biker]

Wow. I’ve been “caught” by gusts before. Not fun.
For reference - which road in North County SD? See you’re from Encinitas and I do a fair amount of riding up there when visiting in laws so am curious.
MB

[deluz]

Originally Posted by mass_biker

Wow. I’ve been “caught” by gusts before. Not fun.
For reference - which road in North County SD? See you’re from Encinitas and I do a fair amount of riding up there when visiting in laws so am curious.
MB

It was the Elfin Forest - Del Dios Hwy loop.
The incident occurred heading west on Del Dios Hwy.
Gusty winds are typical there and combined with the narrow road and high speed traffic I am no longer interested in doing it. Elfin Forest is really good though. It used to be a rough road but it has been repaved and is super smooth. Next time I will probably just do an out and back on Elfin.
Another favorite is doing loops through Rancho Santa Fe. Lots of quiet scenic hilly roads with low traffic.

[AngryScientist]

I'm sure they do a lot of "reverse engineering" - but I'm not convinced these much loved off brands like BTLOS have enough design prowess as the big guys like Campag, Zipp, etc to design the best wheel shapes, especially for something like managing side winds.

That said, if your typical riding has a lot of up and down with gusty winds involved, 40mm wheels are not the right tool for that job.

I'd stick to something lighter and shallower if I were you.

Glad there was just a scare, not a crash!

[deluz]

I will admit I was pushing it down that hill and could have gone slower.
My other bike has 30mm rims also BTLOS that I could use in these situations.
When I was deciding on these wheels I was debating whether to go 35 or 40mm and now I think I would have gone 35mm if I did it over.
For most riding I think 40mm will be ok but I will see how it goes.