V12man Posted October 8, 2015 Posted October 8, 2015 27.5 with 34/10 -42 is similar to29 with 32/10-42You will be lucky to see a 27.5 and a 26" will be nearly a miracle at the Epic.... even the short guys run 29ers....
V12man Posted October 8, 2015 Posted October 8, 2015 Whahaha - once you read it the way you did, you cannot unread it.Unfortunately I am something of an anatomical expert.... sometime my reading skills are not so good....
raptor-22 Posted October 8, 2015 Posted October 8, 2015 You will be lucky to see a 27.5 and a 26" will be nearly a miracle at the Epic.... even the short guys run 29ers.... Sounds like the embodiment of herd mentality going on there. The math don't lie, the development allowed by those gearing combinations leaves the 27.5 slightly ahead at the same cadence.
V12man Posted October 8, 2015 Posted October 8, 2015 Sounds like the embodiment of herd mentality going on there. The math don't lie, the development allowed by those gearing combinations leaves the 27.5 slightly ahead at the same cadence.I am not sure which gearing you are refferring to at all - for the same cadence and same chainring and cassette sizes, the development is only related to the wheel size - the bigger the wheel, the bigger the development - in absolute proportion - that math does not lie. Fact of the matter is that almost nobody at the Epic rides either 27.5 or 26" bikes - it's 29er heaven - and nothing to do with herd mentality at all - best tool for the job... unless one is substantially longitudinally challenged, when the smaller wheels might be more appropriate.
Eldron Posted October 8, 2015 Posted October 8, 2015 1x10/11 if your ego is bigger than your legs. 2x10/11 if you want to go fast.
cadenceblur Posted October 8, 2015 Posted October 8, 2015 1x10/11 if your ego is bigger than your legs. 2x10/11 if you want to go fast.Good point, that said, I am going to give the 1 x 10 a bash for W2W though, but will probably be going with 2 x 11 for the Epic.
Underachiever Posted October 8, 2015 Posted October 8, 2015 You will be lucky to see a 27.5 and a 26" will be nearly a miracle at the Epic.... even the short guys run 29ers.... Seems I need to enter then. Like miracles. Also still running 3x9, another miracle then. Was good enough for last year's CPT - and we weren't too slow either.
Odinson Posted October 8, 2015 Posted October 8, 2015 1x10/11 if your ego is bigger than your legs. 2x10/11 if you want to go fast.
SwissVan Posted October 8, 2015 Posted October 8, 2015 We are racing the masters category. Aiming to finish the race first of all and Top 30 result would be nice. For those of you who know the terrain, is a single chain ring bike ok or double would be better? Thanks IMO for a multi day stage race over unknown terrain it would be better to have to many gears rather than to few....
raptor-22 Posted October 8, 2015 Posted October 8, 2015 I am not sure which gearing you are refferring to at all - for the same cadence and same chainring and cassette sizes, the development is only related to the wheel size - the bigger the wheel, the bigger the development - in absolute proportion - that math does not lie. Fact of the matter is that almost nobody at the Epic rides either 27.5 or 26" bikes - it's 29er heaven - and nothing to do with herd mentality at all - best tool for the job... unless one is substantially longitudinally challenged, when the smaller wheels might be more appropriate.Only if you think that the wheel is doing the driving. The crank is the output device so gearing is considered per revolution of the crank not the wheel. Go back read what I said. By comparing the same size chain rings on different wheel sizes you are not comparing apples with apples. All you are interested in is how far the wheel rolls per revolution of the crank per watt. Assuming similar outputs between a rider on a 27.5 with 34t chainring and rider on 29er with 32t chainring they will travel the same distance in the same time. Force x velocity
W@nna-BE Posted October 8, 2015 Posted October 8, 2015 my partner battled on a 1 x 11, after a few days he had to fit an even smaller ring upfront, then he had some serious issues keeping up on the faster sections. its nice to have the extra gears, epic is a strange beast, you never know when or why you might need the extra gear, chances are you will be pushing your partner a little at some stage, everyone had a bad spell at the epic at some point.
V12man Posted October 8, 2015 Posted October 8, 2015 Assuming similar outputs between a rider on a 27.5 with 34t chainring and rider on 29er with 32t chainring they will travel the same distance in the same time. Force x velocityThis is because the 2 bikes have the same overall gearing.... (assuming they do that is, because I have not checked your calc). You stil cannot say that a 27.5 is faster than a 29er based on the calculation of gearing....
V12man Posted October 8, 2015 Posted October 8, 2015 my partner battled on a 1 x 11, after a few days he had to fit an even smaller ring upfront, then he had some serious issues keeping up on the faster sections. its nice to have the extra gears, epic is a strange beast, you never know when or why you might need the extra gear, chances are you will be pushing your partner a little at some stage, everyone had a bad spell at the epic at some point.Exactly - more gears are useful.... and I suspect we will have a MONSTER stage this year to celebrate the 100th stage - my guess is 100 miles... and that will be a beast - having done the last 145k stage... 160 is going to be interesting if they make it 3000m of climb or more...
Patchelicious Posted October 8, 2015 Posted October 8, 2015 Even if your ultimate net gearing is the same between 27.5 and 29, meaning that each pedal stroke equals the exact same distance the tyre rolls across the group. The added benefit of a lower rolling resistance of a bigger wheel circumference over obstacles already means one apple is better than another for marathons. Add the 1 watt extra needed to get over a 10cm rock, multiple that by the million rocks you need to roll over, and all of a sudden you understand why 29s are the weapon of choice at the Epic... Not really a lemming thing.
Patchelicious Posted October 8, 2015 Posted October 8, 2015 Only if you think that the wheel is doing the driving. The crank is the output device so gearing is considered per revolution of the crank not the wheel.Go back read what I said. By comparing the same size chain rings on different wheel sizes you are not comparing apples with apples.All you are interested in is how far the wheel rolls per revolution of the crank per watt. Assuming similar outputs between a rider on a 27.5 with 34t chainring and rider on 29er with 32t chainring they will travel the same distance in the same time. Force x velocityNot really. If you had a 10 inch rear wheel you would need say a 105 front sprocket to get the same roll per revolution, but would need much higher wattage to achieve it.
raptor-22 Posted October 8, 2015 Posted October 8, 2015 Its a lemming thing because the difference in roll over is so miniscule its not worth considering. the bigger wheel has unsprung mass challenges which also add up and could negate the alleged roll over advantage.
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