Bought these for my P3 tricycle. Use 650ml bottles mostly and they hold up very well. Only once did a bottle fly out of the back seat hydration bladder and it was a very bumpy road. At first I thought they held up too well and I had trouble inserting bottles (gets better with practice). Taking them out is no problem. I do not recommend them for beginners or those who are not 100% comfortable driving and drinking with one hand without looking at the cage when you insert the bottle. For lightness and performance they are a good buy.
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