dezmtber Posted August 31, 2013 Report Share Posted August 31, 2013 Do long cranks still work if your a short arse ? Link to comment Share on other sites More sharing options...
trialsiain Posted August 31, 2013 Author Report Share Posted August 31, 2013 thanks for help guys, just got 165s Link to comment Share on other sites More sharing options...
Ash-Kennard Posted August 31, 2013 Report Share Posted August 31, 2013 i opted for 170's after riding previously with 175's, noticable difference straight away, could gap further immediately. recently changed my gear ratio to 16:13 from 16:14 and again i feel like i am getting a benefit out of it. i think before i was at the ratios' limit for me, but now it is harder to pedal, but can gap further again. the only reason for a light ratio is for natural with short run ups, but i havent found this to be a problem as of yet. cheers, ash Link to comment Share on other sites More sharing options...
dave33 Posted August 31, 2013 Report Share Posted August 31, 2013 Do long cranks still work if your a short arse ? Crank length comes from the length of your legs. As in on road bikes the lager size frames will have longer cranks and long stem, longer reach etc. I think if you have shorter legs then the ill affects of longer cranks might be worse. But not sure Personally I have tried longer and shorter so I could feel the difference. If you can try some out? 1 Link to comment Share on other sites More sharing options...
aener Posted August 31, 2013 Report Share Posted August 31, 2013 the only reason for a light ratio is for natural with short run upsKind of... But I used to have a 24 with 24:14 and at that stage it's very detrimental to anything other than going fast when you've lots of space.You may have had it too light for your body/how you ride, but if you go too far the other way it'll impede your riding just as much (or potentially more if you get silly with it. Haha).(Obviously when we say a "light" gearing, we're actually discussing a gearing being even lighter than the already insanely light average trials gearing, so you'll have a little wiggle room yet I reckon ) 1 Link to comment Share on other sites More sharing options...
Ash-Kennard Posted August 31, 2013 Report Share Posted August 31, 2013 I remember a time when James porter was running 18:17 when everyone else was running 18:15 but it didn't affect him so I was reluctant to go heavier seeing what he could do. But now I'll only be going to change when I swap my front cog as it's a 16. And chains tend to snap with smaller cogs so im wary of that. Then I will have the decision of 18:14 as that is next ratio to trial Cheers ash Link to comment Share on other sites More sharing options...
super Posted September 1, 2013 Report Share Posted September 1, 2013 You also can start closer and still get the same rotations in with shorter cranks. 1 Link to comment Share on other sites More sharing options...
casualjoe Posted September 1, 2013 Report Share Posted September 1, 2013 (edited) Hilarious I know Edit: It's just I always thought the gear ratio and wheel size were the only things to affect distance travelled per crank revolution. Edited September 1, 2013 by casualjoe 1 Link to comment Share on other sites More sharing options...
bing Posted September 1, 2013 Report Share Posted September 1, 2013 (edited) Yes you are right Edited September 1, 2013 by bing Link to comment Share on other sites More sharing options...
Blake Posted September 1, 2013 Report Share Posted September 1, 2013 If you're unsure just ask flipp and he'll call you an idiot so you know for sure you're wrong 4 Link to comment Share on other sites More sharing options...
bing Posted September 1, 2013 Report Share Posted September 1, 2013 The only thing that alters gear ratio is by physically changing a sprocket or freewheel. All long or short cranks do is increase or decrease the amount of effort needed to make the bike move along at that given ratio. You want heavier gearing, get a smaller rear or a bigger front sprocket, or vice versa for lighter gearing. Basic physics dictate if you have a longer lever, less effort is needed to perform the task Link to comment Share on other sites More sharing options...
dave33 Posted September 2, 2013 Report Share Posted September 2, 2013 Hilarious I know Edit: It's just I always thought the gear ratio and wheel size were the only things to affect distance travelled per crank revolution. Shorter cranks give your a small circumference so on a short run up- half pedal stroke you can start closer So your foot actually has to travel less for the same distance the bike moves. Link to comment Share on other sites More sharing options...
AdamR28 Posted September 2, 2013 Report Share Posted September 2, 2013 One 360 degree crank rotation still gives 18/15ths of a rotation of the rear wheel though, so the bike travels the same distance... Your foot travels less, yes, but you can't start closer to the obstacle because the bike travels the same amount of horizontal distance. By your foot travelling less distance it also confirms that shorter cranks give less leverage: work done = force * distance, so if you apply the same force over less distance you have done less work and therefore the bike hasn't accelerated as much. 1 Link to comment Share on other sites More sharing options...
Joe Papasnap Maher Posted September 2, 2013 Report Share Posted September 2, 2013 The End! 1 Link to comment Share on other sites More sharing options...
Mark W Posted September 2, 2013 Report Share Posted September 2, 2013 3 Link to comment Share on other sites More sharing options...
casualjoe Posted September 2, 2013 Report Share Posted September 2, 2013 Cool, I do tend to faceplant walls quite a bit when trying to hook. So should probably try out some shorter cranks. Link to comment Share on other sites More sharing options...
dave33 Posted September 2, 2013 Report Share Posted September 2, 2013 One 360 degree crank rotation still gives 18/15ths of a rotation of the rear wheel though, so the bike travels the same distance... Your foot travels less, yes, but you can't start closer to the obstacle because the bike travels the same amount of horizontal distance. By your foot travelling less distance it also confirms that shorter cranks give less leverage: work done = force * distance, so if you apply the same force over less distance you have done less work and therefore the bike hasn't accelerated as much. So please tell me why all the top riders in the whole wide world use shorter cranks rathan longer ? I'm just trying to help you guys out. But if you want to listen to these guys who arnt really the best riders in the world fair enough. No offense by the way Adam. I give up I also want to make it clear that I'm not claiming to be any good. I'm referring to such risers as Gilles coustellier Vincent hermance kenny bealey and jack Carthy. Jack runs 165 on stock too Link to comment Share on other sites More sharing options...
err Posted September 2, 2013 Report Share Posted September 2, 2013 (edited) So please tell me why all the top riders in the whole wide world use shorter cranks rathan longer ? pedal clearance and weight weenie-ism. also i'd imagine personal preference plays a part. Edited September 2, 2013 by err Link to comment Share on other sites More sharing options...
trialsiain Posted September 2, 2013 Author Report Share Posted September 2, 2013 (edited) I always thought shorter cranks make the bike more responsive to lift the front up for shorter run ups, but that was just a theory haha ? cause i had long cranks on my 24 and it always felt a bit "loose" as if it would have been better with 170mms Edited September 2, 2013 by trialsiain 1 Link to comment Share on other sites More sharing options...
dave33 Posted September 2, 2013 Report Share Posted September 2, 2013 pedal clearance and weight weenie-ism. also i'd imagine personal preference plays a part. Same with Abel- still runs 158mm monty cranks which are old as and he's not even sponsored by monty any more. Strange trend.. Strange they all have the same personal preference Link to comment Share on other sites More sharing options...
Mark W Posted September 2, 2013 Report Share Posted September 2, 2013 In fairness, Abel might want to run them 'cos the Monty cranks are around 360g whereas Ozonys don't really do a light set of cranks (the Bonz cranks they stock on their bikes are well over 500g). Link to comment Share on other sites More sharing options...
dave33 Posted September 2, 2013 Report Share Posted September 2, 2013 In fairness, Abel might want to run them 'cos the Monty cranks are around 360g whereas Ozonys don't really do a light set of cranks (the Bonz cranks they stock on their bikes are well over 500g). Is that a guess or did he tell you that him self ? I will ask him next time I'm chatting to him if you want. Link to comment Share on other sites More sharing options...
AdamR28 Posted September 2, 2013 Report Share Posted September 2, 2013 So please tell me why all the top riders in the whole wide world use shorter cranks rathan longer ? I'm just trying to help you guys out. But if you want to listen to these guys who arnt really the best riders in the world fair enough. No offense by the way Adam. I give up I also want to make it clear that I'm not claiming to be any good. I'm referring to such risers as Gilles coustellier Vincent hermance kenny bealey and jack Carthy. Jack runs 165 on stock too I'm not sure actually. A lot of trials is really psychological it seems. One rider does something which may well be placebo and everyone copies, it's just the way it is. No offence at all - people can do what they want, but the physics doesn't change. 1 Link to comment Share on other sites More sharing options...
Mark W Posted September 2, 2013 Report Share Posted September 2, 2013 I could ask him in Belgium I suppose. 1 Link to comment Share on other sites More sharing options...
trialsiain Posted September 2, 2013 Author Report Share Posted September 2, 2013 I'm not sure actually. A lot of trials is really psychological it seems. One rider does something which may well be placebo and everyone copies, it's just the way it is. No offence at all - people can do what they want, but the physics doesn't change. like the forward bar angle ? 1 Link to comment Share on other sites More sharing options...
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