Need help adjusting a seat
 

I know this is a long shot but I have a vintage giant rs950 shimano and the other day I went to get my bike tuned up and the height of the seat was adjusted and now I can’t reach the pedals. I can provide pictures tomorrow. If anyone can help it would be great

Looking at photos it looks like the seat post adjusts like any other? Is something stuck?

1. Grab an Allen/hex key of the appropriate size.
2. Undo the seat post clamp bolt - remember how many turns or half turns you make until the seat post is loose.
3. (optional) Put a smear of grease on the seat post just above where the seat post enters the frame.
4. Push the seat post down into the seat tube. Try not to twist it too much.
5. While ensuring the saddle is aligned with the frame, tighten seat post clamp bolt the same number of turns or half turns as you did to undo it.
6. Take it for a test ride.
7. Repeat steps 2-6 until desired saddle height is reached.
8. Remove IPA from fridge and reward yourself for a job well done.

My guess is the OP won't have the appropriate wrench

^^^ If not a multi tool from Amazon will provide the hex wrenches and a be a good take along tool for rides, I like the Topeak ones. failing that a metric hex wrench set from the local hardware store does the trick

Why not just go back to the shop and ask them to lower it? Although, if you have the tool, it’s pretty simple. And the correct height is rarely found without some trial and error.