Originally Posted by
hw_user
1. Replace the crank arm with a shorter one.
I wouldn't do that regardless, but is it a one-, two-, or three-piece crank?
Originally Posted by
hw_user
2. Replace the front wheel with a smaller wheels (not sure what's the impact by having difference size front and back wheel)
Absolutely not. The frame was designed for a specific wheel size. The next size smaller is 24" -- the brakes won't line up correctly and it will handle weird.
Originally Posted by
hw_user
3. Replace the frame with a bigger frame.
Maybe ... but getting all the old parts to retrofit might be a challenge, as seat tube diameter, bottom bracket dimensions, headset, brake type, etc. all have to be the same as the old frame.
Originally Posted by
hw_user
I am not a bike mechanic.
Take it to one and let them have a look before you do anything else. I suspect this is either a routine toe overlap issue or the frame and/or fork are damaged.