The rear dérailleur is a RD-6207. Could it cope with a 8 speed 12-32 or 11-26 cassette?
I’m assuming no on the 12-32 because it’s a short cage, but maybe on the 11-26?
VeloBase.com - Component: Shimano RD-6207, 600EX
seems yeah for the 26, na for 32, providing your front double doesn’t have a massive diff in teeth number.
The front is 39/53.
yeah, I can’t see any problem as that would have been one of the popular chainring combos when the derailleur was designed.
also, nice work on including the macron/hypen thing above the ‘e’ in derailleur (I thought I was picking about editing my posts for spelling and grammer).
Looking on Velobase it says the maximum cog size is 28t. I’ve found a 11-28, so I might grab that. The other one I saw is 12-25.
I’ve had one working nicely on a 28.
That is the iPhone auto correct!
Velobase also says max chain wrap is 28T so technically you should be running a 14-28T cassette.
No biggy as you probably never want to run 53-28 anyway.
Yeah, I wouldn’t be cross-chaining that much! 39 x 28 would be the only way I’d run it.
you note that velobase says friction?, so you might have a few probs if trying to run with indexed shifters
Yeah, running friction at the moment.
Basically I need a new wheelset for my steel roadie (I stole the 7 speed wheelset off it for my 'cross bike), so I figure I might as well gain another speed when I get a new wheel set.
I don’t wanna have to upgrade anything else if I don’t have to.
sweet, thats the good thing about friction I guess, don’t matter how many gears (to a point).
I did not knew this. Sheldon doesn’t like it though.
méh
too Frénch for my liking.
Shéldon?
Gabriel Gaté in the house!
Hate to tell you this but it’s easier to scrap the old groupset altogether. It will actually save you money (and time) by doing so now rather than throwing good money after bad later. Old stuff is great if you want to stick within conservative limits (it’s old worn parts your dealing with, not NOS) and if you keep it simple. As has been pointed out before it would be smarter to replace the cranks for a 110bcd or smaller and use chainrings (34/48) to achieve easier overall gears, rather than expecting miracles from less than capable derailleur/shifters (which is what you’re hoping for).
There are but a few old style derailleurs that can handle wide range/capacity. A new $24 long cage derailleur would walk the pants off anything made that collectors hoard and pay fat money for and easily do what you hope for.
Shimano Acera M360 7/8sp Rear Mech | Buy Online | ChainReactionCycles.com
I’d still change out the cranks for a smaller bcd (don’t worry about matchy/matchy groupset myopia, parts is just parts) before thinking about derailleur/cog options. A gear chart/calculator is your friend, work out what gear range you’re after, crunch the numbers and go from there.
Why? As has been noted it’s touch and go whether your shift levers have enough cable pull to shift a derailleur across 8 cogs (130bcd). Maybe, maybe not. That’s why I suggest not maxing cable pull and derailleur capacity and opting for useful range via chainrings (ie 13/24 at back, 34/48 up front is pretty easy/safe).
<Il Vecchio>
Would it be cheaper to buy some new 9spd durace ace Downtube shifters @ ~60 rather than a crankset? As they would definetly pull enough cable. Plus you could go index if you put a 9spd cassette.