Hello,

I would like to make some changes to my 1993 Diamondback Topanga MTB. It still has all the original components (Shimano Altus 7 sp set; rapid-fire 7-sp shifters; 12-28 cassette, 28-38-48 crank, cantilever brakes).

I would like to keep the rapidfire shifters, the cantilever brakes and front derail. but put in other new parts, mainly to put in lower gear.

Is it ok to make changes such that it will end up
-Altus 7-sp rapid fire shifters (Original)
-Altus front derail. (Original)
-LX Crank (9-sp; 22-32-44) (New)
-14-32 cassetter (New)
-Deore or LX rear derail (9-sp) (New)
-cantilever brakes (Original)

Do you see any problems as it is or anything else needs to be changed?

The cost of all the replacements will definitely be more than what the bike is worth now: I just like the bike so would rather keep it than get a newer model, but do you think it's worth the cost doing this?

Thank you.