raptor-22 Posted October 8, 2015 Posted October 8, 2015 Not 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. maybe in that extreme case yes. But in the real world where 3 inches covers all the arguments its much less of a practical issue and is easily dealt with through gearing.Which explains why Nino keeps up with Julien and 26er under fit riders don't get dropped by fit riders on 29ers
Patchelicious Posted October 8, 2015 Posted October 8, 2015 maybe in that extreme case yes. But in the real world where 3 inches covers all the arguments its much less of a practical issue and is easily dealt with through gearing.Which explains why Nino keeps up with Julien and 26er under fit riders don't get dropped by fit riders on 29ersRule number 1 of anything mathematical. Exaggerate the metrics you are using to illustrate the theories plausibility. Have a watch here: In the case of Julian vs Nino, you are bringing in the riders and their individual metrics. this makes the discussion way more complex. Also, this is a different discipline again. Sorry OP, hijack off. Simple answer is, go with 2x10/11 ............ and a 29er
Eldron Posted October 8, 2015 Posted October 8, 2015 Rule number 1 of anything mathematical. Exaggerate the metrics you are using to illustrate the theories plausibility. Have a watch here: https://www.youtube.com/watch?v=SGGnbcLx8fs In the case of Julian vs Nino, you are bringing in the riders and their individual metrics. this makes the discussion way more complex. Also, this is a different discipline again. Sorry OP, hijack off. Simple answer is, go with 2x10/11 ............ and a 29er And a duallie!
V12man Posted October 8, 2015 Posted October 8, 2015 Not 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.Um - NO - assuming all frictional losses are the same in the 2 setups, then the wattage required will be the same to achieve the same groundspeed.
Patchelicious Posted October 8, 2015 Posted October 8, 2015 Um - NO - assuming all frictional losses are the same in the 2 setups, then the wattage required will be the same to achieve the same groundspeed.Hmm You might have a point here about the gearing I concede, but the frictional losses are not the same... so what is being debated then? Edit: Ps: My point still stands, that on equally geared 27.5 vs 29er for the same rider at same speed the 29er will require less power to maintian... due to inertia, rolling resistance and a few other factors.
Baracuda Posted October 8, 2015 Posted October 8, 2015 Search this website for discussions on the topic on last years Eric. There some ladies on this site who reckon they can tackle any hill in the Cape all day with a 36t, but it seems like most dudes were recommending 30t upfront, 32t if you strong. https://community.bikehub.co.za/topic/147758-cape-epic-2015-1x11-chainring-advice/
raptor-22 Posted October 8, 2015 Posted October 8, 2015 Hmm You might have a point here about the gearing I concede, but the frictional losses are not the same... so what is being debated then? Edit: Ps: My point still stands, that on equally geared 27.5 vs 29er for the same rider at same speed the 29er will require less power to maintian... due to inertia, rolling resistance and a few other factors. Where are these frictional losses? It's not in the contact patch since friction is not married to surface area Internal losses in the tyre? Very small and negligible. At the end of the day you don't gear a bike to have the same chainring size as the bigger wheel bike. You gear it so the displacement is similar for a revolution of the crank shaft. Power being similar gearing development being similar with appropriate Gearing both bikes with travel the same distance. That is science. Chainring size is just a cog in the drivetrain. Play with a gearing calculator that allows for wheel size correction. You will see that I speak the truth. In cases where 26ers cannot keep up its likely because the bike is fittedwith too small a chain ring to provide appropriate gearing
Baracuda Posted October 8, 2015 Posted October 8, 2015 Chainring size is just a cog in the drivetrain. Play with a gearing calculator that allows for wheel size correction. You will see that I speak the truth. You will know the truth, and the truth will make you free (John 8:32)
Patchelicious Posted October 8, 2015 Posted October 8, 2015 Where are these frictional losses? It's not in the contact patch since friction is not married to surface area Internal losses in the tyre? Very small and negligible. At the end of the day you don't gear a bike to have the same chainring size as the bigger wheel bike. You gear it so the displacement is similar for a revolution of the crank shaft. Power being similar gearing development being similar with appropriate Gearing both bikes with travel the same distance. That is science. Chainring size is just a cog in the drivetrain. Play with a gearing calculator that allows for wheel size correction. You will see that I speak the truth. In cases where 26ers cannot keep up its likely because the bike is fittedwith too small a chain ring to provide appropriate gearingLook here I'm not trying to argue with you, but you cannot list a bunch of criteria to consider then you dismiss them because they are negligible in your opinion and don't support your stance. That's not science. All criteria need to be considered. This isn't religion, it isn't my opinion vs yours. There is only one truth when it comes to maths. 1+1=2 no matter what, if we are applying the rules incorrectly, oh well mistakes are made and admitted. So let's try again. What statement, in summary, are you trying to make about wheel sizes?
arendoog Posted October 8, 2015 Posted October 8, 2015 Nobody has asked the big Q .how much does the rider weigh ? !00kg rider 1x11 [Jy gaan bloei !] 60kg rider 1x11 [jy gaan race } I like my top and bottem and use them all the time
Patchelicious Posted October 8, 2015 Posted October 8, 2015 Wheel size is irrelevantOk cool, let's debate that statement.
Gen Posted October 8, 2015 Posted October 8, 2015 Ok cool, let's debate that statement.Aggenee.. not again...[emoji17] It's all about the Base bout the base bout the base no treble [emoji444] Let's rather have a dance off
raptor-22 Posted October 8, 2015 Posted October 8, 2015 Ok cool, let's debate that statement. can i first do 90min on i-magic?then i'm ready for you
Patchelicious Posted October 8, 2015 Posted October 8, 2015 But I think we can start a new thread, this poor dude didn't expect all this by asking a little question.
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