Originally Posted by
Mulberry20
The prior two posts are proof positive you should take internet advice with a grain of salt.
There is no way in hell you can or should run 28 tires on wheels of that era and width.
They will not seat properly even if they can be mounted at all.
The fact it is a 3 mm difference is totally irrelevant. A 28 mm tire will likely size 29 or 30 nowadays.
I am a mechanical engineer I should know.
You'd think so, but.... The reason tires these days measure wider than nominal is because the rim widths have increased. A 28mm tire on his narrow rim will more likely than not measure close to 28mm. It's when you mount them on current 19+mm internal rims that they are wider. Nobody but OP can know if a 28mm tire, one size larger than stock, will work. If it doesn't, it will be because of tight frame and fork dimensions, nothing to do with his rims.
