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PostPosted: Sun Nov 13, 2016 9:33 pm 
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I'm a happy owner of a pair of zipp 303 nsw. And while my 2017 supersix himod does have clearance for wider tires, I noticed some rub between the rim and chainstay (right side only) when I'm out of the saddle on very steep grades (10%+) and tilting the bike sideways.

Zipp recommends the 404 in these cases, but it's only like 0.7mm narrower what makes me wonder if it makes any difference.

Does anybody have experience with these wheels regarding flexing? I'm only 130lbs and it's very surprising to be honest. Also it feels like a design issue on cannondale's part. Seriously.

Also, how big of a deal is this? The funny thing is that I have no brakepad rub, just the rim rubbing the chainstay. But I guess it can be a big issue later if the rim works itself into the chainstay.


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Posted: Sun Nov 13, 2016 9:33 pm 


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PostPosted: Mon Nov 14, 2016 9:35 am 
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My V3 808 used to do the same thing in my SL4 tho I get up to 95kg at times. I think its more the wide wheels than the frame itself. Frame manufacturers struggle to keep up with the wheel makers.

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PostPosted: Mon Nov 14, 2016 9:55 am 
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nemeseri wrote:
Zipp recommends the 404 in these cases, but it's only like 0.7mm narrower what makes me wonder if it makes any difference.


The difference in max width is small but the important bit is that with the 404 the widest part is further towards the center of the wheel (hub), so the chainstays are wider at that point. Don't quote me exactly but it's around 12mm further up so you can probably gain 2mm each side depending on the bike and how much the stays flair.


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PostPosted: Mon Nov 14, 2016 1:56 pm 
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Location: Loveland, CO
What's the clearance between rim and bike when the bike is stationary? If the distance is 2mm or more than I say the wheel is to blame.

Not all bikes fail to keep up to the wheel makers. My Fuji has gigantic clearances for wide wheels everywhere.


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PostPosted: Mon Nov 14, 2016 7:09 pm 
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Well, they redesigned the frame recently (2016) to fit 28mm tires, but the the chainstays shape up like like a lightbulb now. To be fair, there is some room on both sides (3-4mm) and I have to swap out the wheels to make 100% sure that's the wheel that flexing and rubbing. On the other hand I can easily push the rim to contact the chainstays by hand so I'm almost sure that's the issue.

Dez33 wrote:
The difference in max width is small but the important bit is that with the 404 the widest part is further towards the center of the wheel (hub), so the chainstays are wider at that point. Don't quote me exactly but it's around 12mm further up so you can probably gain 2mm each side depending on the bike and how much the stays flair.


Thanks. This is really helpful. Actually this might make things worse, because the space between the chainstays gets narrower closer to the hub a bit. :?


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PostPosted: Mon Nov 14, 2016 8:11 pm 
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nemeseri wrote:
On the other hand I can easily push the rim to contact the chainstays by hand so I'm almost sure that's the issue.


You need to check, adjust the bearings on the hub. Something is too loose in the hub.


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PostPosted: Tue Nov 15, 2016 6:11 am 
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I'm not sure if the 1mm is really to blame here. I have the hi mod black with Enve 4.5's laced to CK hubs. I've ran up to 28mm tubs and have plenty of clearance when looking at it and have seen no signs of rubbing. Also ran this set up on my synapse without issue. When i swapped over to some alloy training wheels for winter, i did notice rubbing on the chainsaty even though the rim is narrower. It's more than likely the zipp hubs and lacing which i have heard isn't the stiffest set up giving you issues, that's what i found out anyway with my alloy wheels


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PostPosted: Tue Nov 15, 2016 8:10 am 
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isn't the enve 4.5 rear wheel narrower than the front? more like a 24mm compared to almost 28mm on 303


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PostPosted: Tue Nov 15, 2016 10:58 am 
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It's 25.5 according to their site vs 26.4 for the Zipps at the brake track. I'll have to take another look but i thought there was a lot of clearance, more than enough to accommodate 1.5mm extra either side of the rim


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PostPosted: Tue Nov 15, 2016 10:58 pm 
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I just checked and I see around 2.5 / 3mm between the widest part of the rim and the chainstays. I think under load it might be ok for the wheel to flex that much. Maybe I'm wrong, but I can easily flex my other wheels by hand to touch the brake pads. Anyway, I will bring the wheel to an LBS to look at them.

willmac wrote:
I'm not sure if the 1mm is really to blame here. I have the hi mod black with Enve 4.5's laced to CK hubs. I've ran up to 28mm tubs and have plenty of clearance when looking at it and have seen no signs of rubbing. Also ran this set up on my synapse without issue. When i swapped over to some alloy training wheels for winter, i did notice rubbing on the chainsaty even though the rim is narrower. It's more than likely the zipp hubs and lacing which i have heard isn't the stiffest set up giving you issues, that's what i found out anyway with my alloy wheels


The zipp 303 28.5mm wide at the widest point and that causes the issue. I have plenty of room at the brake track and tires.


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PostPosted: Fri Nov 18, 2016 10:41 am 
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I've got firecrest 303/404 combo (f/r) on my 2015 SuperSix Black Inc and I get some minor rubbing on the brake pads but flex is nowhere near the chainstay. I'm 75kg max though and maybe the 404 rear does help with this.


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PostPosted: Fri Nov 18, 2016 11:01 pm 
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Just had a look on my frame, i have exactly 3/8 of an inch on both sides with the enve rims. That's 4.7mm either side, if your zipps are 28.5mm that only leaves around 2mm either side for flex at the chainstays, this should be enough there though. Have you have the spoke tension and bearings pre-load checked? If they are new wheels they may need a bit of an adjustment after a couple of hundred Km's


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PostPosted: Mon Nov 21, 2016 7:37 pm 
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sussexhills wrote:
I've got firecrest 303/404 combo (f/r) on my 2015 SuperSix Black Inc and I get some minor rubbing on the brake pads but flex is nowhere near the chainstay. I'm 75kg max though and maybe the 404 rear does help with this.


I wonder if cannondale changed the shape of the chainstays in 2016. It's good to know that you have no issue with the 404 in the back. Definitely an alternative for me.

willmac wrote:
Just had a look on my frame, i have exactly 3/8 of an inch on both sides with the enve rims. That's 4.7mm either side, if your zipps are 28.5mm that only leaves around 2mm either side for flex at the chainstays, this should be enough there though. Have you have the spoke tension and bearings pre-load checked? If they are new wheels they may need a bit of an adjustment after a couple of hundred Km's


I contacted Cannondale and they recommend 5mm on each sides (that makes only 25mm wide rims compatible officially which is a shame IMO). I also dropped off the bike at my LBS and have them take a look. While the rubbing is very loud under load, maybe I'm just stupid and confuse the sound with simple brake track rubbing. Hopefully they will take a look at spoke tension and hub pre-load.


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PostPosted: Mon Nov 21, 2016 10:32 pm 
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Joined: Sun Aug 07, 2016 9:32 pm
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I running 2016 Zipp 303's on a 2016 supersix evo SM - it's tight but I've not experienced any rubbing from the tyre or the rim..


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PostPosted: Sat Nov 26, 2016 4:49 am 
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Just to close this thread on a positive note: my LBS and I confirmed that it was brake pad rubbing and not chainstay or seat stay, so the zipp 303 nsw fits the 2017 cannondale supersix himod.

ALTOUGHT, I also noticed the same very loud vibration during hard braking and it sent me researching. I found that the new zipp nsw is very sensitive to the brake pad position and the more I toed in the pads, the harder the vibration got. So instead of toeing in, I mounted my brake pads flat and suddenly this solved the vibration problem completely. Also noticed that the brake rub due to flex (the issue I started the thread about) got more quiet and something I'd call normal. Yay!


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Posted: Sat Nov 26, 2016 4:49 am 


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