Dewald Posted August 17, 2022 Share Good day. Is it possible to replace my 53/39 Dura Ace 10 sp with 50/34 on the same spider, and who would be able to supply blades ? Thank you. Link to comment Share on other sites More sharing options...
Thomo Posted August 17, 2022 Share Suspect you'll be hard-pushed to find compact chainrings for a 130 bcd crank. Newer Shimano cranks are 110 bcd with 53/39 and 50/34 rings both fitting that standard. Link to comment Share on other sites More sharing options...
Genie Posted August 17, 2022 Share 33 minutes ago, Dewald said: Good day. Is it possible to replace my 53/39 Dura Ace 10 sp with 50/34 on the same spider, and who would be able to supply blades ? Thank you. Nope, u need 110BCD spider, old 5 arm shimano , I swopped mine out for Tiagra Link to comment Share on other sites More sharing options...
David Marshall Posted August 17, 2022 Share I was able to swap my DA 53/39 for an Ultegra 50/34. I don't think there were many 10 speed DA compacts around. If you buy a crank - new or second hand - get one that takes the new blades. 5 bolt chain rings are not that freely available and supply will only get worse. Link to comment Share on other sites More sharing options...
Dewald Posted August 17, 2022 Share Appreciate the advice. It does not have to be Dura Ace, all I want is any type of 50/34 blades that will fit Ultegra will be great if available? Link to comment Share on other sites More sharing options...
Mongoose! Posted August 18, 2022 Share Dura Ace 7800 only came in 130 bcd thus a 50/34 will not fit. I actually looking for a 7800 crank to complete one of my vintage builds... and have a spare compact crank (110 bcd) but unfortunately it is not a Dura Ace 😔 Link to comment Share on other sites More sharing options...
Dewald Posted August 18, 2022 Share Hi Mongoose. Can you give me more info on the crankset you have. If I can't get blades for my crank looks like my only option will be to get a 50/34 complete crankset with the same type bottom bracket. Thx. Link to comment Share on other sites More sharing options...
buckstopper Posted August 18, 2022 Share They did do a 52 in 7800. Not sure about inner ring possibilities though. Link to comment Share on other sites More sharing options...
Dewald Posted August 18, 2022 Share The 52 will be ok, my problem is I need the 34. Link to comment Share on other sites More sharing options...
Smartie Posted August 18, 2022 Share Smallest inner ring on 130bcd is 38t. I have Ultegra 10-speed (6700) cranks and fitted a SRAM 38t on the inside. You can get Stronglight blades in silver from bikeinn: https://www.tradeinn.com/bikeinn/en/stronglight-shimano-adaptable-130-bcd-chainring/137172532/p Edited August 18, 2022 by Smartie Link to comment Share on other sites More sharing options...
Dewald Posted August 18, 2022 Share Thx mate. Looks like I'll have to replace the complete crankset to get a 50/34. Anyone out there have one available please let me know. Thx. Link to comment Share on other sites More sharing options...
Smartie Posted August 18, 2022 Share The alternative is to replace your cassette? Though there would be limitations in how large you can go - depending on your derailleur. However, even this can be overcome with a Wolftooth Roadlink: https://www.wolftoothcomponents.com/collections/drivetrain-1/products/roadlink I originally had 52/39 cranks, but wanted 52/36, which was not possible without replacing my crank. So went 52/38 and put on a larger cassette at the back to give me the desired ratio. Sheldon Brown can help with this calc: https://www.sheldonbrown.com/gear-calc.html Edited August 18, 2022 by Smartie Link to comment Share on other sites More sharing options...
Thomo Posted August 18, 2022 Share 27 minutes ago, Dewald said: Thx mate. Looks like I'll have to replace the complete crankset to get a 50/34. Anyone out there have one available please let me know. Thx. Touch base with Mongoose. (see post above) Perhaps you two can work out something. Link to comment Share on other sites More sharing options...
Ripryder Posted August 18, 2022 Share 4 hours ago, Mongoose! said: Dura Ace 7800 only came in 130 bcd thus a 50/34 will not fit. I actually looking for a 7800 crank to complete one of my vintage builds... and have a spare compact crank (110 bcd) but unfortunately it is not a Dura Ace 😔 I have a 53...39 if you are interested? DURA ACE Mongoose! 1 Link to comment Share on other sites More sharing options...
Dewald Posted August 18, 2022 Share Then I will have two. I need a 50/34 Thx. dirtypot and Genie 2 Link to comment Share on other sites More sharing options...
Mongoose! Posted August 18, 2022 Share 21 minutes ago, Dewald said: Then I will have two. I need a 50/34 Thx. only one if we swop ... (with cash difference depending on condition of yours and arm 🙃 ) Link to comment Share on other sites More sharing options...
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