Question about Frame torque during heavy acceleration

hmmmm....I used to get that with my old Araya rims in the late '80s, and I had it once with a Mavic CD4. I eventually put the now discontinued Mavic CXP30 on the rear of 3 of my bikes. They're heavy, but as stiff and strong as anything.

I'd definetly be inclined to think that it's the wheels doing it, and not the frame.
Perhaps try to borrow some sort of heavier, 30mm deep wheel to see if it still happens

531Aussie said:

hmmmm....I used to get that with my old Araya rims in the late '80s, and I had it once with a Mavic CD4. I eventually put the now discontinued Mavic CXP30 on the rear of 3 of my bikes. They're heavy, but as stiff and strong as anything.

I'd definetly be inclined to think that it's the wheels doing it, and not the frame.
Perhaps try to borrow some sort of heavier, 30mm deep wheel to see if it still happens

I have a similiar body built (5' 9'' / 185lbs) to your built and I ride a Ti frame. When I was riding this frame with Mavic Open Pro wheels, I could feel a lot of flex (not severe). However, I am now riding Campy Eurus wheels and I do feel as much flex. The Campy wheels do have 30-mm extrusion profile rim.

Thanks guys. The bontregers are Race lites and the Mavics are the Comos. My understanding was that the cosmos were a pretty stout wheel, but I'm really pretty new to the sport-about 3.5 years or so- and have mostly gone with componets that came on my bikes. It sure is a weird feeling when your back wheel get's squirly! The reson I asked about the frame is a buddy of mine torqued his older carbon frame so bad that he slightly deformed it. Anyway, thanks for the help!

[img]jensonusa.comDetailedDescription.gifOpen ↗[/img][img]jensonusa.comArrowTab.gifOpen ↗[/img][img]jensonusa.comspace.gifOpen ↗[/img][img]jensonusa.comspace.gifOpen ↗[/img][img]jensonusa.comspace.gifOpen ↗[/img]For those of you that prefer a more traditional road wheel, Mavic offers the Cosmos. For 2004, it's even lighter and more reliable, and a great wheelset for training, fast touring, and other riding where the durability of a higher spoke-count wheel is needed.

Mavic sealed cartridge bearing hubs form the basis for the wheels. 24 radially laced spokes are used in the front wheel, with 28 in a 3x pattern used in the rear. The spokes are stainless steel, straight pull type with brass nipples.

The rims are 6106 aluminum alloy with a SUP welded joint and UB control braking surface, so your braking is perfectly smooth and grab free.

The Cosmos wheelset is delivered with Mavic aluminum quick releases, user guide, and rim tape.

[right]Rims:[/right]
6106 aluminum [right]Hubs:[/right]
Mavic sealed cartridge bearing [right]Spokes and Nipples:[/right]
Mavic stainless straight pull[right]Weight:[/right]
front 820g, rear 1000g

What about riding technique? I don't have the same dimensions (tall and lanky) so I probably put out less sprinting power and may not have experienced what you're talking about. But the thought occurred to me that your technique may be a component as well. I used to lean too far forward when accelerating very hard out of the saddle and would sometimes lift the rear wheel, or at least un-weight it enough to allow it to shimmy and slide side to side. Maybe try putting more weight over the back wheel? Just a thought.

azdroptop said:

I own a Lemond Carbon Steel Buenos Aires and have noticed on numerous occasions that when I stand and accelerate hard-maximal effort and power-I get pretty suvere real tire wobble! It has done it when I've had both my Mavic and Bontreger wheels on the bike. I am 5'9" and 188lbs with large legs-ex bodybuilder, and able to generate good power. Just wondering if I should consider a different bike to combat the problem? Different material etc, or is it something else? Thanks in advance.

Probably not the cause, but I would also check the joints between the carbon and steel on the seatstays to make sure that they are sound.

friedmikey said:

What about riding technique? I don't have the same dimensions (tall and lanky) so I probably put out less sprinting power and may not have experienced what you're talking about. But the thought occurred to me that your technique may be a component as well. I used to lean too far forward when accelerating very hard out of the saddle and would sometimes lift the rear wheel, or at least un-weight it enough to allow it to shimmy and slide side to side. Maybe try putting more weight over the back wheel? Just a thought.

This could be the cause! Never thought of it. Next time it occurs I'll keep it in mind. thank you. 🙂