louiso Posted December 5, 2006 Share Had a chat to some guys in Natal who are using the rotorings on their bikes. According to them an excellent investment as it reduce the deadspot and is really effective on climbs. Must say it looks terrible. Any hubbers with some advice or experience with these chainrings. Link to comment Share on other sites More sharing options...
Mudsimus Posted December 5, 2006 Share I know Ivanb is the man to speak to. I'm also look for some info. You dont perhaps have the internet addres for the chainrings? Link to comment Share on other sites More sharing options...
Windbreaker Posted December 5, 2006 Share I've also got a question that MDK555 or one of the other tandem fundi's can answer (not you Big H - you just think you know all the answers ). Why aren't the two cranks on a tandem offset by a few degrees - similar to the angle created by the q rings? That would eliminate the dead spot. Or not? Link to comment Share on other sites More sharing options...
Mudsimus Posted December 5, 2006 Share I also gave that one some thought. I think it will make standing very hard...and it will mean that there will be a point that one rider will do most of the work. Link to comment Share on other sites More sharing options...
louiso Posted December 5, 2006 Share The only websites I could find:http://www.pureendurance.net/rotor_q_rings http://www.rotorcranksusa.com/i1-q-rings.shtml Trust this could assist you. Link to comment Share on other sites More sharing options...
jog5000 Posted December 6, 2006 Share Arent they the same as Shimano Biopace? I thought it was proven that they werent that good. Link to comment Share on other sites More sharing options...
Cashandra Posted December 6, 2006 Share I've got myself a set, and they are awesome, they give me more power on my downstroke, used them for the SA TT and walked away with gold, definitely got my vote of confidence, you have 5 settings on them and can change them depending on the route ( hilly or flat) Put on the new TT version yesterday which is a 54 blade, feels and looks awsome ( solid black blade ) you can contact Ivan ( importer of the Q ring) 073 3735999 and web is www.rotorbike.com ENJOY. Link to comment Share on other sites More sharing options...
BikeMax Posted December 6, 2006 Share I've also got a question that MDK555 or one of the other tandem fundi's can answer (not you Big H - you just think you know all the answers ). Why aren't the two cranks on a tandem offset by a few degrees - similar to the angle created by the q rings? That would eliminate the dead spot. Or not? Quite a few racing tandems do just that - questionable whether it makes any difference. Going faster on a bike is not about pedalling technique - it is about better w/kg. Faster riders do not eliminate the "dead spot" they push down harder. Link to comment Share on other sites More sharing options...
mdk555 Posted December 7, 2006 Share I've also got a question that MDK555 or one of the other tandem fundi's can answer (not you Big H - you just think you know all the answers ). Why aren't the two cranks on a tandem offset by a few degrees - similar to the angle created by the q rings? That would eliminate the dead spot. Or not? Yep is does help eliminate the deadspot. In the USA offsetting the cranks by up 5 teeth is very popular and the general feeling is that it does help especially on the climbs however when it comes to racing (and trust me they are big into racing tandems with up to 50 tandems competing on tight 1 - 3 km circuits) not only are the cranks in sync, but they are shortened by up to 5 cm. I have seen pics of tandems going thru corners that wil scare the living daylight out of all of us and there can be no room for error. Me versus offsetting cranks versus oval rings - no thanks as it looks very uncool and rather perfect the full circle (push, scape, pull) Link to comment Share on other sites More sharing options...
Bike Tech Posted August 19, 2007 Share http://www.noncircularchainring.be In case you want to learn more about non circular chainrings, please read above mentioned scientific study. I am looking forward to receive your comments. Bike Tech2007-08-19 07:19:22 Link to comment Share on other sites More sharing options...
BikeMax Posted August 19, 2007 Share http://www.noncircularchainring.be In case you want to learn more about non circular chainrings' date=' please read above mentioned scientific study. I am looking forward to receive your comments. [/quote'] How do you deal with the fact that the limit to cycling performance is cardiovascular, and therefore it is not possible to increase the amount of work done by changing the phase of the pedals (unless you prove that circualr rings see a significant loss of energy in the pedal stroke - which you have not shown) Link to comment Share on other sites More sharing options...
Barend de Arend Posted August 19, 2007 Share I've also got a question that MDK555 or one of the other tandem fundi's can answer (not you Big H - you just think you know all the answers ). Why aren't the two cranks on a tandem offset by a few degrees - similar to the angle created by the q rings? That would eliminate the dead spot. Or not? Quite a few racing tandems do just that - questionable whether it makes any difference. Going faster on a bike is not about pedalling technique - it is about better w/kg. Faster riders do not eliminate the "dead spot" they push down harder. Depending on the angle, that'll be exactly what happens. You can't push harder with Q-Ring because its the same legs. However, you can spend more time pushing, and less time moving your legs forwards or backwards. If the gear is harder up/down and easier forward/backwards you will definitely spend a higher percentage of your cycling time in the power part of the circle. So the net effect is: a higher percentage in the "good" part of your stroke, and a lower percentage in the "bad" stroke. Link to comment Share on other sites More sharing options...
amdretard Posted August 19, 2007 Share Here we go again ! *sits and gets the popcorn ready Link to comment Share on other sites More sharing options...
Barend de Arend Posted August 19, 2007 Share Here we go again ! *sits and gets the popcorn ready Salt, butter, sugar or plain. Link to comment Share on other sites More sharing options...
amdretard Posted August 19, 2007 Share Last time i had salt and it got a bit much ! i think caramel this time [] Link to comment Share on other sites More sharing options...
dylankeyter Posted August 19, 2007 Share haha, wow the other one was over 40 posts wasnt it?! Link to comment Share on other sites More sharing options...
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