Hey all.

I need to replace my fork on an old Motobecane Mirage. Yes I know, sell your piece of Sh*t French bike etc...

The wheels are 27" and the current original fork is 23" & 7/8s or so. The steerer is 22.5 cm, and I need one that is at least 23.5 cm to fit the new headset.

Does anyone have any ideas? They don't seem to be easy to find.

Ash

You presume much. Inexpensive components but actually Moto made nice frames even at that level.

You have four choices:

Straighten fork if repairable (you did not say why you need to replace the fork).

Find a French-threaded fork, built for a 27" wheel, with a long enough fork column. Best if it comes with headset.
https://www.ebay.com/itm/like/140650252393?lpid=82

Replace fork and headset with standard threaded, as well as stem and bars (arguably way too expensive, unless it's all used parts).

Say goodbye to bike.

I feel our pain, same thing happened to my bike. I would recommend replacing the fork and headset with a standard threaded version, and it can probably be had cheaper than you think if you go to a bike kitchen, that is, a non-profit bike shop that sells used parts. Looks like you're in NYC, try this place: https://www.recycleabicycle.org/shops.

Don't know much about them, but they look like the place to help, or they might know another place that can.

Finally, best part about going standard is if you ever decide to upgrade our bike, you already have a decent fork.

go to a bike shop they may have a dead bike in the basement with a suitable fork.

if its not French you need a normal 7/8" quill stem or be clever and make a 0.1mm thick shim sleeve
to make up the difference between 22.0 and 22.2mm ..