Have a pristine '85 Fuji Allegro w/ 12spd gears. Can this bike be converted
to a 18spd by changing the front cog from 2 to 3 gears? Or would the conversion cost more than the bike was worth?
Front cogs=42,52 w/ 170mm chain
Rear spindle= 14,16,19,22,26,30
Thought adding a 32 cog to the front would help with climbs.
(01-02-2014, 10:54 PM)oldfoxb Wrote: Have a pristine '85 Fuji Allegro w/ 12spd gears. Can this bike be converted
to a 18spd by changing the front cog from 2 to 3 gears? Or would the conversion cost more than the bike was worth?
Front cogs=42,52 w/ 170mm chain
Rear spindle= 14,16,19,22,26,30
Thought adding a 32 cog to the front would help with climbs.
Bottom line only you can decide if it is worth it or not. Many people put money into bikes merely because they just love the bike and want to modify it to suit themselves better. I often will take new bikes straight from the box and gut them and rebuild to suit for various reasons.
Going from a double to a triple can most always be done but requires perhaps a triple crankset, bottom bracket, front derailleur, could even involve replacing the rear derailleur also.
If you can, post some pics of your system that you have now, i.e. shifters, rear/front derailluers, model numbers/names if possible. clear close-up shots of your bottom bracket area and we can better guide from there. but expect anywhere from $100 to even as much as $200 or more depending on the components you choose for this mod
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
A new front derailleur and crank set can be inexpensive, but as Painkiller said, you will have difficulty calculating where the new chain rings will line up with your existing bottom bracket.
Do you use the 52 tooth front chain ring?