_Daemon_ Posted August 4, 2006 Share What's everyone's gear ratio's, thinking of buying a new crankset(actually new campy groupset) and trying to figure out if I should go for a compact crank. How would a 50/34 with a 11-23 casette work? Would I have the same top end speed of a normal double but with a 12-25 casette in the back and better climbing gears? Link to comment Share on other sites More sharing options...
Cois Posted August 4, 2006 Share Road: 52 / 42 with 12-23 MTB: Dont have a clue but I have a sop bord for a granny Link to comment Share on other sites More sharing options...
splat Posted August 4, 2006 Share Try this link from FSA for an explaination: http://www.fullspeedahead.com/downloads/compact.pdfInteractive spreadsheet for comparisons: http://www.fullspeedahead.com/downloads/copy_Rollout%20chart .xlsI must admit I havent read through it myself, but have looked at the comarisions and comments from other people and understand that the 50/11 gear is a bit faster than a 53/12 gear on the flats (for the same cadence), and the 34/23 is a bit easier than a 39/25 gear on the climbs.The advantages are a slighly lighter drivetrain (smaller chainrings, smaller cassette and a shorter chain) and closer gear ratios. Some people say that a compact (more curved) front mech is required while others say that a properly adjusted from mech is sufficient. Shimano doesnt do anything special, but FSA and Campy have compact front mechs.Good luck with your desicion and enjoy your new groupset!splat38933.3538657407 Link to comment Share on other sites More sharing options...
linnega Posted August 4, 2006 Share Splat has it spot on. 50-11 is as near as dammit to 53-12 as you would care to be, and 34-23 is about 39-26. So you lose nothing but have a wider spread of gear options. It is true about compacts dropping the chain more often as the jump from 50-34 is much bigger than 53-39. Despite that I don't see myself ever riding a 53-39 again. Link to comment Share on other sites More sharing options...
_Daemon_ Posted August 4, 2006 Share Looks good. MMh...looks like I will be going for a 50/34 - 11/23 combination then. Link to comment Share on other sites More sharing options...
Gumpole Posted August 4, 2006 Share I've got a 50/34 - 11/23 and the 34/23 was used quite a bit at the top of boulders smileys/smiley9.gif, however I think that for 95% of races, with racing up and down rolling hills a 50/36 would be better as there is a huge gap between the big and small chainring. If you are a LA wannabee and go up hills spinning like a MTBer in the granny gear then get the 34! Link to comment Share on other sites More sharing options...
ewep Posted August 4, 2006 Share Can I make the assumption that for me to convert my current crankset (53/39) to a compact will only entail changing the crankset itself, nothing else? Link to comment Share on other sites More sharing options...
smallrebel Posted August 4, 2006 Share Ratio = 50 * 27 / 11 395336501195.72727130.090988.36364122.72731287.75119.2581112.51381110.076974.76923103.84621475.21429102.214369.4285796.428571570.295.464.8901665.812589.437560.7584.3751761.9411884.1764757.1764779.411761858.579.554751955.4210575.3157951.1578971.052632052.6571.5548.667.52150.1428668.1428646.2857164.285712247.8636465.0454544.1818261.363642345.7826162.2173942.2608758.695652443.87559.62540.556.252542.1257.2438.8854 Link to comment Share on other sites More sharing options...
splat Posted August 4, 2006 Share Assuming the the crankset you choose uses the same bottom bracket, you should be A for AWAY! (I dont think that there are any Q factor issues).You would have to drop your front mech slightly and possibly shorten your chain a bit. Link to comment Share on other sites More sharing options...
ewep Posted August 4, 2006 Share Splat, I got a FSA Gossamer crankset with external bearings and a 31.8mm clamp on front der. Would I only have to buy the crankset? Link to comment Share on other sites More sharing options...
Sir Fed Posted August 4, 2006 Share Take one link out the chain, drop the front derailleur about 5mm and you are done. No need for a compact derailleur, a friend has one and I don't, neither of us drops the chain very often (not more than I did before anyway). I use a 25-12 for training and a 21-11 for racing with a 50/34 up front, its the best thing since sliced bread. Link to comment Share on other sites More sharing options...
ewep Posted August 4, 2006 Share I have one of those "can't drop your chain from the small ring" type thingys on my bike! Thanks Sir Fred, now to get a LBS that stock them and pricing in cold JHB! Link to comment Share on other sites More sharing options...
splat Posted August 4, 2006 Share ewep: if the compact crank you buy uses the same BB as your current one, you are ready to go. Your LBS should be able to sort you out. Link to comment Share on other sites More sharing options...
ewep Posted August 4, 2006 Share splat, on my road bike I prefer fixing my own parts, etc. Link to comment Share on other sites More sharing options...
ewep Posted August 4, 2006 Share Does anyone in Jhb know of a LBS that stocks FSA? I've phone Cyclelab and Westdene cycles and no one has a crankset available. Link to comment Share on other sites More sharing options...
Sir Fed Posted August 4, 2006 Share Try Slipstream Cycles, I thought I saw a FSA in the cabinet there the other day - 011 463 7226 Link to comment Share on other sites More sharing options...
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