CaptainDura Posted October 10, 2008 Share So i saw on supercycling the new trend to use 2 chainring cranks with a 29 teeth as the smaller and 44 as the bigger ring with a larger tooth cluster at the back. Apparently this gives you the same ratio than your granny gear does. anyone tried this before ? It seems to make sense for mtb as a bigger granny (29 instead of 22):1. will be less likely to have chainsuck. 2. will wear slower than the smaller granny3. will require less shifting on the front4. will weigh less (for the weight weenies out there)5. should keep the chain straighter between the two rings as apposed to the three rings.6. most importantly will cost less in a perfect world as there are less material, bolts etc etc. although the bike manufacturers will most likely charge more for it. What are the cons ? and lastly can one convert a current three ring crank to a double ? Link to comment Share on other sites More sharing options...
TNT1 Posted October 10, 2008 Share Dunno, but I contemplate putting a compact double on the mtb every time I ride it... Link to comment Share on other sites More sharing options...
turtlek Posted October 10, 2008 Share Dunno' date=' but I contemplate putting a compact double on the mtb every time I ride it... [/quote'] i have done this and it works very well for power training about the first post will not keep the chain straighter but will give you shorter shifts on the front derailer and you will have trim adjustments if set up correctly why it will not keep the chain straighter is because with it being a double the chances of cross chaining are increased because of the spacing on the double being closer also you can convert your current triple to a double but just make sure you set the derailer properly or your chain suck issues will triple instead of going away Link to comment Share on other sites More sharing options...
#Pete# Posted October 10, 2008 Share You can't easily go much 'larger' than 34T for your cassette. So if you're comforatable riding with a 22 x 26 as your easiest gear, that equals a gear ratio of 29 x 34. Hope you won't miss the 28, 32. Me - I'm not nearly strong enough and prefer not to push. Link to comment Share on other sites More sharing options...
Kiwi Posted October 10, 2008 Share A lot of 36/22 sets comming out now like Shimano SLX all mountain cranks. Link to comment Share on other sites More sharing options...
Giant Posted October 10, 2008 Share If you have the same top and bottom ratio's with fewer overall gears,you are going to end up with bigger gaps between gears.I for one like that each shift is only a small difference, so I gan get an exact gear for spead and available power. I very rearely get chain suck, a well maintained correctly lubed drive chain keeps most of that at bay. I'm a lot more likly to put a tripple on my road bike than I am to put a double on my MTB. Link to comment Share on other sites More sharing options...
markStockton Posted October 10, 2008 Share My Cannondale has a 29 / 44 crank matched to a 11 - 34 cassette and seems to give me all the gears I want. I think a double crank is a much better idea on all levels. Link to comment Share on other sites More sharing options...
NotSoBigBen Posted October 10, 2008 Share My Cannondale has a 29 / 44 crank matched to a 11 - 34 cassette and seems to give me all the gears I want. I think a double crank is a much better idea on all levels. Noticed that last night but thought I wouldn't comment else there may be something said about my pink girls blouse 'normal' crank on my bike ..... Link to comment Share on other sites More sharing options...
Jules Posted October 10, 2008 Share Has anybody tried putting a road crankset on a MTB? Link to comment Share on other sites More sharing options...
markStockton Posted October 10, 2008 Share Has anybody tried putting a road crankset on a MTB? I've heard rumor from a reasonably reliable resource that Andrew McLeans Prototype had a Dura Ace crank fitted. My bike when it was recently serviced and needed a new BB got a road one. I'm not a expert on these matters but do think that a 105 crank might be a well priced place to start looking for a conversion kit. Link to comment Share on other sites More sharing options...
markStockton Posted October 10, 2008 Share Noticed that last night but thought I wouldn't comment else there may be something said about my pink girls blouse 'normal' crank on my bike ..... You should try it as I'm sure you have both better leg strentgh and cadence than me. Link to comment Share on other sites More sharing options...
turtlek Posted October 10, 2008 Share i rode crater cruise last year on a compact road crank not an issue with shifting at all and would definitely recommend it perfect ratios for most hills and great for top end speed Link to comment Share on other sites More sharing options...
Jules Posted October 10, 2008 Share i rode crater cruise last year on a compact road crank not an issue with shifting at all and would definitely recommend it perfect ratios for most hills and great for top end speed Sounds promising. Are all MTB BBs English thread? Ie, is it an easy conversion? Link to comment Share on other sites More sharing options...
NotSoBigBen Posted October 10, 2008 Share i rode crater cruise last year on a compact road crank not an issue with shifting at all and would definitely recommend it perfect ratios for most hills and great for top end speed Sounds promising. Are all MTB BBs English thread? Ie' date=' is it an easy conversion? [/quote'] I suspect so Jules, I never seen an Italian fred MTB in my time. I have an MTB BB on my roadbike (albeit with a spacer on each side!) no problem. Long story that ........ Link to comment Share on other sites More sharing options...
turtlek Posted October 10, 2008 Share yes all MTB BB's are english thread (well everyone of them that i have worked on) yes its an easy conversion you just need to get your cable tension correct a road derailer (if it will fit on the frame) and you keep your normal shifter you will then have a bit of trim adjustment aswell so that your chain does not rub Link to comment Share on other sites More sharing options...
TNT1 Posted October 10, 2008 Share i rode crater cruise last year on a compact road crank not an issue with shifting at all and would definitely recommend it perfect ratios for most hills and great for top end speed Sounds promising. Are all MTB BBs English thread? Ie' date=' is it an easy conversion? [/quote'] I suspect so Jules, I never seen an Italian fred MTB in my time. I have an MTB BB on my roadbike (albeit with a spacer on each side!) no problem. Long story that ........ But I have seen Bianchi mtb's.... guess they have eyetie thread... Link to comment Share on other sites More sharing options...
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