weak knees after a ride

when i do a longish ride, i have issues, when i get back walking down stairs, feeling weak and needs to support and slow my descent on the stairs...
any ideas? and what to do!
regards
any ideas? and what to do!
regards
Giant Trance X0 (08) Reverb, Hope Hoops 5.1D, XT brakes, RQ BC, Works Components headset 1.5
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Is there anything new to your rides?
When you ride are your turning big gears rather than using a higher cadence?
Desmond Tutu
it's not simply about distance, it's how hard are you pushing, you can use a lot of energy,if you don't replace it then you may feel very tired/weak afterwards
I think stair descending is just a very coordinated action that relies on all your muscles responding in a predictable way.
Later on I strengthened my leg muscles at the gym and never got them again. I was using the leg press at 525lb setting so pretty much nothing could cause that weakness going down the stairs. Now I am nowhere near that leg strength so I occasionally get it after pushing it in a high gear.
Perhaps do lunges whilst holding weights. I find those harder than squats and they tend to work the legs in different ways. I think they probably help with balance in the muscles too. Kind of like recruiting other leg muscles together in a more natural way I think. Anyway last time I was in a gym and used the services of the trainer she gave me these lunges to do. Also some one legged exercises that I have forgotten now. All with weights to increase the effect. That did result in feeling weak going down the stairs more than the 525lb leg press believe it or not.