Join Date: Apr 2011
Location: Minnesota/Arizona and between
Bikes: Trek Madone 4.7 WSD, 1969 Schwinn Collegiate, Surly Long Haul Trucker, Terry Classic, Gary Fisher Marlin, Litespeed Ocoee
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I have had bikes where the top tube is too high for me. I am very short. In recent years I have been able to find better fitting bikes as bikes now are readily available with sloping top tubes. How tall are you? What is your cycling inseam? That is, the distance from your crotch to the floor.
To specifically answer your question, this is how I get on bikes that are too big for me:
I straddle the bike. To do this, the bike will have to lean to one side.Otherwise, I can't clear the top tube. I lean my bikes to the left.
I put my right foot on the right pedal so I can push off.
I push off while simultaneously rising to the seat. The bike will straighten itself up as you push off.
I stop by dropping my right foot to the ground, again leaning the bike to the left.
Of course, it is best to find a bike that fits.
Is the bike you got used? I have never heard of anyone welding the seat post into the frame. If you can't get the seat at the right height no matter what you will be uncomfortable and it will limit the amount you can ride.