Miccie Posted August 21, 2023 Share Hi. Out of desperation, I recently had to replace my 11 speed DI2 Dura Ace inner derailleur cage, and due to lack of parts in SA as I believe Shimano no longer supports 11 speed, I had an oversized pulley cage retrofitted. It looks very nice, I must say and there's no problem with shifting, however I noticed a distinct difficulty in climbing. (I ran out of gears), which wasn't previously a problem. I'd like to know if a larger pulley wheel would have an effect on gear ratio, and if so is there a fix for this? Do I now need to replace my cassette and chain as well? Thanks in advance. Link to comment Share on other sites More sharing options...
Barry Posted August 22, 2023 Share It shouldn't have any affect on gear ratios. The front chainring will turn the rear wheel according to tooth count. The pully is a chain guide. A rollout using old cage and new cage should be the same. dasilvarsa 1 Link to comment Share on other sites More sharing options...
dasilvarsa Posted August 22, 2023 Share Have You Verified that it is actually shifting to the Biggest Ring at the Back ? Might Just Need Adjustment. Cage cannot change ratio. Jbr and Nickyr 2 Link to comment Share on other sites More sharing options...
Prince Albert Cycles Posted August 22, 2023 Share 9 hours ago, Miccie said: Hi. Out of desperation, I recently had to replace my 11 speed DI2 Dura Ace inner derailleur cage, and due to lack of parts in SA as I believe Shimano no longer supports 11 speed, I had an oversized pulley cage retrofitted. It looks very nice, I must say and there's no problem with shifting, however I noticed a distinct difficulty in climbing. (I ran out of gears), which wasn't previously a problem. I'd like to know if a larger pulley wheel would have an effect on gear ratio, and if so is there a fix for this? Do I now need to replace my cassette and chain as well? Thanks in advance. Is the chain not too short ? Link to comment Share on other sites More sharing options...
Barry Posted August 22, 2023 Share Bling always makes you faster. 😂🤣 Mtree and Cappi 1 1 Link to comment Share on other sites More sharing options...
BikeisLife Posted August 22, 2023 Share OSPW should make climbing very slightly easier as rollover is a bit smoother, definitely not harder. Mtree and DieselnDust 1 1 Link to comment Share on other sites More sharing options...
Edereese Posted August 22, 2023 Share 1 hour ago, Prince Albert Cycles said: Is the chain not too short ? I think this could be the problem. OSPW requires a longer chain. Mtree and DieselnDust 2 Link to comment Share on other sites More sharing options...
droo Posted August 22, 2023 Share 2 hours ago, Prince Albert Cycles said: Is the chain not too short ? 👆 Link to comment Share on other sites More sharing options...
DieselnDust Posted August 22, 2023 Share 2 hours ago, BikeisLife said: OSPW should make climbing very slightly easier as rollover is a bit smoother, definitely not harder. Tisk tisk snigger snigger snoooooort Headshot 1 Link to comment Share on other sites More sharing options...
DieselnDust Posted August 22, 2023 Share The chain needs an extra link added b screw might need to be turned out to max to give the upper guide pulley clearance so that the chain does not engage with the sprocket and pulley wheel simultaneously. other than that you should not be having any other problems with gearing unless the derailleur cannot get the largest sprocket Link to comment Share on other sites More sharing options...
droo Posted August 22, 2023 Share 1 hour ago, DieselnDust said: Tisk tisk snigger snigger snoooooort But it's SCIENCE! You even get faired ones now, so you don't sacrifice aero for chainbendyness gains. ChrisF, DieselnDust and Thomo 3 Link to comment Share on other sites More sharing options...
DieselnDust Posted August 22, 2023 Share 3 minutes ago, droo said: But it's SCIENCE! You even get faired ones now, so you don't sacrifice aero for chainbendyness gains. You mean those ones that add 20w at 45km/hr while sipping a beer over a braai with mates?😂 Mtree, gerriemtb and dave303e 3 Link to comment Share on other sites More sharing options...
ChrisF Posted August 22, 2023 Share 6 minutes ago, DieselnDust said: You mean those ones that add 20w at 45km/hr while sipping a beer over a braai with mates?😂 Come on .... SURELY you have access to the secret low friction oils that borders on mechanical doping .... DieselnDust and gerriemtb 2 Link to comment Share on other sites More sharing options...
DieselnDust Posted August 22, 2023 Share 7 minutes ago, ChrisF said: Come on .... SURELY you have access to the secret low friction oils that borders on mechanical doping .... 😂 I have access to a lot of things but a box of lies is where I stop short…. tou know those three laws of thermodynamics that can’t be violated well ya those okes selling those OSP rape those laws with every new product. We should have frictionless bikes by now Edited August 22, 2023 by DieselnDust bikebloke, Mtree and ChrisF 3 Link to comment Share on other sites More sharing options...
splat Posted August 22, 2023 Share 1 hour ago, droo said: But it's SCIENCE! You even get faired ones now, so you don't sacrifice aero for chainbendyness gains. https://the5krunner.com/2022/06/23/ospw-coke-vs-ceramic-speed/ Nickyr, devvydoesdonuts, michaelbiker and 5 others 8 Link to comment Share on other sites More sharing options...
dave303e Posted August 22, 2023 Share 2 hours ago, DieselnDust said: 😂 I have access to a lot of things but a box of lies is where I stop short…. tou know those three laws of thermodynamics that can’t be violated well ya those okes selling those OSP rape those laws with every new product. We should have frictionless bikes by now I call bull dust, powerbalance bracelets, fad diets and the R21 000/liter chain lube are exempt from science... DieselnDust and ChrisF 2 Link to comment Share on other sites More sharing options...
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