To All You Cannondale SI Crank Owners..
Moderator: robbosmans
I'm looking to change my chainrings on my Cannondale SI from FSA N10 to possibly a Praxis Works or a Cannondale Spider Ring. The spidering is a fair bit more in price but is it worth it? I'm not sure about the weight difference but which one would you choose.
£102
http://www.cyclesurgery.com/pws/UniqueProductKey.ice?ProductID=CPRX0001KK
£160
http://www.westbrookcycles.co.uk/cannondale-opi-spidering-compact-50t-34t-kp245-p232831
£102
http://www.cyclesurgery.com/pws/UniqueProductKey.ice?ProductID=CPRX0001KK
£160
http://www.westbrookcycles.co.uk/cannondale-opi-spidering-compact-50t-34t-kp245-p232831
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A Cannondale Spider Ring on a Cannondale SI gives added value IMHO. Aestheticaly speaking it is better, more "compatible" as well.
I have the Praxisworks 52/36 rings on my SiSL crankset. Shifting is considerably better than the stock FSA rings. Would get Praxisworks rings again next time I'm looking for aftermarket rings for any of my bikes.
The spidering shifts great and is stupid light. The only reason not to use it is if you're using a power meter spider.
I went with Praxis as well. Got a good deal on a lightly used classic standard. That and using campy which I am sure works ok with the spiderings but probably not as well and not as tested as with the Praxis rings. Can't beat the weight of the spidering but the Praxis rings aren't that bad either.
It seems that the Praxis chainrings I bought don't work with my Cannondale SI cranks / spider (2014 synapse HiMod Ultegra). They are a correct match re: bolt size etc.
I tried to replace the stock FSA rings, but the praxis rings are a mm too far apart when installed resulting in the chain dropping between the two rings and jamming.
Thought it was just me, so I took it to the workshop and without explaining the problem they looked at it and came to the same conclusion - seemingly not compatable.
This is odd because this and other threads suggest other people have managed it.
I have no explanation for why this should be, thought the small chainring on the FSA has a 1mm deep recess where it bolts and the praxis doesn't, and this is what seems to result in that 1mm gap with the praxis which causes all the problems.
Am now going for FSA k-lite rings which the shop says should be fully compatable.
I tried to replace the stock FSA rings, but the praxis rings are a mm too far apart when installed resulting in the chain dropping between the two rings and jamming.
Thought it was just me, so I took it to the workshop and without explaining the problem they looked at it and came to the same conclusion - seemingly not compatable.
This is odd because this and other threads suggest other people have managed it.
I have no explanation for why this should be, thought the small chainring on the FSA has a 1mm deep recess where it bolts and the praxis doesn't, and this is what seems to result in that 1mm gap with the praxis which causes all the problems.
Am now going for FSA k-lite rings which the shop says should be fully compatable.
secteur wrote:It seems that the Praxis chainrings I bought don't work with my Cannondale SI cranks / spider (2014 synapse HiMod Ultegra). They are a correct match re: bolt size etc.
I tried to replace the stock FSA rings, but the praxis rings are a mm too far apart when installed resulting in the chain dropping between the two rings and jamming.
Thought it was just me, so I took it to the workshop and without explaining the problem they looked at it and came to the same conclusion - seemingly not compatable.
This is odd because this and other threads suggest other people have managed it.
I have no explanation for why this should be, thought the small chainring on the FSA has a 1mm deep recess where it bolts and the praxis doesn't, and this is what seems to result in that 1mm gap with the praxis which causes all the problems.
Am now going for FSA k-lite rings which the shop says should be fully compatable.
Do you have di2 by chance? I had the same issue: 52/36 Praxis rings, SI crankset, Di2 (although i'm running a power2max type s). Front shifting was terrible, after both I and the LBS called praxis to find a solution their response was basically "too many third party parts, it's never going to work correctly". I was surprised in their attitude given all the boasting they do about having the best rings and working great with di2. They even sell them on the Power2Max site bc they say they're the best. I ended up getting rid of Di2 for Campy and they work great, same crank & same spider, so it has to be a Di2 compatibility issue.
Ltoddokc wrote:
Do you have di2 by chance?
No, it's Ultegra 6800; BB30A, cannondale Cranks & spider - the cranks say "SI" but the crank bolts say "SISL2", FSA rings.
The Praxis rings just wouldn't work - they were just 0.5mm or so too far apart when fitted to the spider, so the chain kept dropping between the rings.
The FSA k-lite rings fit and work perfectly, and look better. To be honest I doubt I'd even tell the difference between Praxis and FSA anyway, so should have just gone with the FSA in the first place.
Odd that others have had no problems, but mine just wouldn't work at all. Both I and the workshop couldn't get them to work, so it wasn't just me doing something wrong.
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