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Crankset Conversions
I am mid-process [I have the triple cranks and triple front derailleurs
bought] in changing two mid-1980s roadbikes from road doubles to triples to ease hill climbing, but recent posts here have me a little scared... I knew I would need new bottom brackets or at least spindles, and planned to let the LBS help in getting that right. Both bikes have 8-speed chains (one is a 6-speed and other is a 7-speed). Both have (old) Shimano 600 rear derailleurs. Question #1: Will those rear derailleurs likely work with the triple so long as I train the missus to stay out of the small-small combos? She is more the slow-cadence grinder so the 52/42/30 will suit her. I am a spinner and intended to go 45/39/30 or thereabouts. Question #2: Will that present any added problems beyond putting the front derailleur in the right place? Question #3: Would it be easier for me to dump the un-installed triple equipment and go to compact cranks? Even getting down to a 34 would be an improvement over the existing 42 small rings. I understand that the chainring spacing on the triples is different than on doubles. Question #4: Since our shifters are friction (I know, how quaint) does that matter? I wish we could afford two new bikes, but I just spent the equivalent on textbooks for the kids in college, so the old bikes will need to get us up the hills for 2-3 more years. David |
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#2
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Crankset Conversions
David wrote: I am mid-process [I have the triple cranks and triple front derailleurs bought] in changing two mid-1980s roadbikes from road doubles to triples to ease hill climbing, but recent posts here have me a little scared... I knew I would need new bottom brackets or at least spindles, and planned to let the LBS help in getting that right. Both bikes have 8-speed chains (one is a 6-speed and other is a 7-speed). Both have (old) Shimano 600 rear derailleurs. Question #1: Will those rear derailleurs likely work with the triple so long as I train the missus to stay out of the small-small combos? ' Yes...the issue will probably be bog-big combo tho...an artifically too short chain to prevent pulley to biggest cog interference when in the smallest ring-biggest cog combo. She is more the slow-cadence grinder so the 52/42/30 will suit her. I am a spinner and intended to go 45/39/30 or thereabouts. Question #2: Will that present any added problems beyond putting the front derailleur in the right place? Nope- Question #3: Would it be easier for me to dump the un-installed triple equipment and go to compact cranks? Even getting down to a 34 would be an improvement over the existing 42 small rings. No compact is as low as the 30t smallest ring. All you have mentioned will be fine with a short cage rear der. If extreme combos won't be good for her, get a long cage rear der, like an inexpensive Deoe or LX and that will work fine with all the rest of what you have-about $35-$40 or so. I understand that the chainring spacing on the triples is different than on doubles. Question #4: Since our shifters are friction (I know, how quaint) does that matter? It's not-same spacing-no problem. I wish we could afford two new bikes, but I just spent the equivalent on textbooks for the kids in college, so the old bikes will need to get us up the hills for 2-3 more years. David Don't expect a new bike to magically make you climb better. The 'bicycle' is a very small part of the cycling performance equation. |
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