Edumacator
Join Date: Jan 2018
Location: Goose Creek, SC
Posts: 6,876
Bikes: '87 Crestdale, '87 Basso Gap, '92 Rossin Performance EL-OS, 1990 VanTuyl, 1980s Losa, 1985 Trek 670, 1982 AD SLE, 1987 PX10, etc...
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Does it have a brand name? That might help solve why it is 35mm.
kroil is a good penetrant to let soak in a few times, but leverage and removal of wrench sloppiness is the key.
We all have different opinions on whether or not to remove if it is staying in, but if you choose to remove the key is penetrant.
If you have a coop near you, it might pay to see if they have a fixed cup remover.