I’ve been having this issue with my rear wheel where it or the tire on it feels squirmy under load. This happens in hard efforts like powering over the top of a climb when it’s flattening out.
Truing the wheel and changing the tire and tube setup has not solved the issue, dropouts are fine and this happens with a duraace skewer or a titanium through axle one.
I’m a little bit annoyed by this because of course it’s not fun to feel like the bike is shaking you out of doing your best power.
Need some more details, please. What wheels, tires, and bike is this occurring on? What pressure are the tires inflated to? Tubeless or tubes? If tubes, which type? How much power?
Check your frame very carefully. On the 2 occasions I’ve had this happen the frame was cracked and the crack was opening up under load. It wasn’t long until total failure.
Next time be cognisant of how far you’re leaning forward as you crest and the gradient lessens. You may be putting insufficient weight on the rear wheel as you continue to power forward. Perhaps not enough for it to skip and hop, but I have to consciously move my weight back to mitigate this due to a 130 slammed stem, low stack height, and a frame that’s maybe slightly small for me.
I prefer the forward standing position in this hill sprint scenario, but if my rear wheel starts to lift then I’m losing power transfer/propulsion to the ground and I just need to lessen my lean a little.
Hopefully it’s this, but do check your frame, too.
I’ve also felt it on older frames and low spoke-count wheels also—flex.
Worn or not enough preload on the adjustable wheel bearings. A crack in the frame, but generally these show up as a spooky sensation when cornering hard as well. You say you’ve trued the wheel is there enough tension in the spokes? The titanium axled QR won’t be helping, are you doing up the Dura-Ace one tight enough i.e leaving a mark in your hand when its tightened?
Maybe you’ve just got strong enough to flex the frame and or wheel?
That is a good point about the adjustable wheel bearings, I replaced the rear wheel and it went away so I’m thinking that these shimano R9100 hubs actually did start to wear out around the preload system.
I prefer the forward standing position in this hill sprint scenario, but if my rear wheel starts to lift then I’m losing power transfer/propulsion to the ground and I just need to lessen my lean a little.
I’m on board with you, I’ve done the same workout 2 years in a row to sharpen up for some crit style efforts, around 10th rep I always feel like I’m getting it out good but the bike is on socks as I come over the top of the climb.
A bit negligent on the maintenance I think i’m done with rim brake wheels and ready to embrace a 2kg set of disc brake wheels as long as they don’t become beat up after 2 months of use like my last 2 wheelsets.
That sounds odd. I have had many, many wheels with Shimano hubs (mostly XT, currently XTR) on mountain bikes and have never done any maintenance on them. Without fail, they lasted as long as the bike lasted and were still working flawlessly as far as I could tell.
2 kg?!?
Just have a look at e. g. Hunt’s aluminum wheelsets, they sell a 34 mm deep, 1,565 g aluminum wheelset for about 500 €. That’s less than my admittedly deeper carbon wheelset.