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PostPosted: Wed Aug 23, 2017 10:18 pm 
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Posts: 16
Hi, I've searched and searched but can't find an answer to this odd problem so hope someone can help:

I've got a 2015 supersix evo hi mod frameset and just bought a Hollowgram SI chainset to put on it.
Unfortunately, the guy I bought it from had it on a Synapse and thus had a 109mm spindle, rather than a 104mm spindle (never crossed my mind)
Tried to assemble but failed as the spindle was too wide for the shell so there was no compression at all.

Question:
Can I use the 109mm spindle if I get x2 2.5mm spacers and put one on either side? Or am I oversimplifying?

Thanks,
Ben


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Posted: Wed Aug 23, 2017 10:18 pm 


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PostPosted: Wed Aug 23, 2017 10:22 pm 
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Posts: 130
BB30A is assymetric. You need one 5mm spacer on the NDS thats it. It will not change the pedalling geometry or bearing load compared to BB30, so all will be fine.


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PostPosted: Wed Aug 23, 2017 10:25 pm 
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Joined: Wed Sep 12, 2012 9:00 pm
Posts: 590
Location: Az USA
Just follow this
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PostPosted: Wed Aug 23, 2017 11:40 pm 
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Kurets wrote:
BB30A is assymetric. You need one 5mm spacer on the NDS thats it. It will not change the pedalling geometry or bearing load compared to BB30, so all will be fine.


That's really helpful, thanks. Can I just check to make sure I fully understand:
- My BB = BB30 (68mm) would normally take a 104mm spindle
- A 109mm spindle is designed for BB30A (73mm, 5mm added to the NDS)
- by adding 5mm spacer to the NDS I effectively increase the width of the BB by 5mm to compensate for the longer spindel.
- does that mean also mean I'm increasing my Q factor by 5mm or does the SI chainset compensate through crank arm geometry?

I've ordered some SRAM BB spacers (2x 2.5mm) as I couldn't find a 5mm BB spacer. Will that do?


Thanks again


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PostPosted: Thu Aug 24, 2017 12:00 am 
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Location: Welland, Ontario
I believe the Q factor will remain the same as a standard BB30.

There has been a long perpetuated myth that the BB30 design produces a low "Q" factor. An untruth which keeps getting repeated and won't go away.

The design does offer more ankle clearance than others but there is no inherent "Q" factor difference when compared to any other crankset.

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PostPosted: Thu Aug 24, 2017 12:17 am 
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Posts: 646
The newer generation Hollowgram cranks (with newer graphics), have the Q-Factor difference factored in to the arms already. The Q-Factor is the same with a 109 spindle as it was with the old cranks with a 104 spindle. If you use the new set with a 104 spindle, your Q-Factor will be 5mm narrower, which takes it down to 139mm.


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PostPosted: Thu Aug 24, 2017 11:16 am 
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dudemanppl wrote:
The newer generation Hollowgram cranks (with newer graphics), have the Q-Factor difference factored in to the arms already. The Q-Factor is the same with a 109 spindle as it was with the old cranks with a 104 spindle. If you use the new set with a 104 spindle, your Q-Factor will be 5mm narrower, which takes it down to 139mm.


I've got these
http://www.cannondale.com/en/USA/Gear/G ... 8548e38fe1
Do you know if they have the Q-factor compensation worked into the arms already?


Attachments:
File comment: My crank set
c16_SiSL25034Hero_2.jpg
c16_SiSL25034Hero_2.jpg [ 79.77 KiB | Viewed 766 times ]
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PostPosted: Thu Aug 24, 2017 5:13 pm 
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Posts: 480
Location: RVA,USA
I am just about done putting together a 2015 caad10. I'm using a 109mm spindle, 2.5mm DS spacer, 7.5mm NDS spacer, and wave washer. This bike has a 68mm shell also, my caad12 has a 73mm shell. I can use the same cranks between both bikes, I just use the 2.6mm NDS spacer on the caad12 and the 7.6mm NDS spacer on the caad10.

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PostPosted: Fri Aug 25, 2017 2:11 am 
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Bliquid wrote:
I've got these
http://www.cannondale.com/en/USA/Gear/G ... 8548e38fe1
Do you know if they have the Q-factor compensation worked into the arms already?


Yes, thats the "corrected Q-Factor" crankset.


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PostPosted: Fri Aug 25, 2017 11:28 am 
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Thanks, I'll pop the 5mm on when it arrives and report back.
B


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PostPosted: Sat Aug 26, 2017 10:22 am 
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So 5mm spacer NDS isn't giving me enough compression - not sure why, given that my maths tells me that should make up for the difference between a 109 and a 104 spindle but the wave washer isn't even being touched when assembled (haven't torqued it fully but can see that another quarter turn of the bolt wouldn't cut it).

Evan, regarding the below, can I just clarify: on your CAAD10 are you using 7.5NDS (to get the right compression) and then 2.5 DS to make sure the chainset is still only positioned 5mm further out on the NDS to compensate for using a 68mm BB30, rather than the 73mm BB30A(symmetrical)?

evan326 wrote:
I am just about done putting together a 2015 caad10. I'm using a 109mm spindle, 2.5mm DS spacer, 7.5mm NDS spacer, and wave washer. This bike has a 68mm shell also, my caad12 has a 73mm shell. I can use the same cranks between both bikes, I just use the 2.6mm NDS spacer on the caad12 and the 7.6mm NDS spacer on the caad10.


EDIT just found the attached on the Qwerty website - hard to read but basically says 7.5mm NDS 2.6mm DS. Don't have a 2.6 but guessing a 2.5 should do the job?

Thanks,
B


Attachments:
Screen Shot 2017-08-26 at 10.33.05.png
Screen Shot 2017-08-26 at 10.33.05.png [ 69.22 KiB | Viewed 557 times ]
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PostPosted: Sat Aug 26, 2017 12:41 pm 
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Posts: 912
Location: Pa USA
Also, be sure your spindle is oriented correctly, it has a drive and a non drive side.


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PostPosted: Sat Aug 26, 2017 5:42 pm 
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Posts: 480
Location: RVA,USA
Bliquid wrote:
So 5mm spacer NDS isn't giving me enough compression - not sure why, given that my maths tells me that should make up for the difference between a 109 and a 104 spindle but the wave washer isn't even being touched when assembled (haven't torqued it fully but can see that another quarter turn of the bolt wouldn't cut it).

Evan, regarding the below, can I just clarify: on your CAAD10 are you using 7.5NDS (to get the right compression) and then 2.5 DS to make sure the chainset is still only positioned 5mm further out on the NDS to compensate for using a 68mm BB30, rather than the 73mm BB30A(symmetrical)?

evan326 wrote:
I am just about done putting together a 2015 caad10. I'm using a 109mm spindle, 2.5mm DS spacer, 7.5mm NDS spacer, and wave washer. This bike has a 68mm shell also, my caad12 has a 73mm shell. I can use the same cranks between both bikes, I just use the 2.6mm NDS spacer on the caad12 and the 7.6mm NDS spacer on the caad10.


EDIT just found the attached on the Qwerty website - hard to read but basically says 7.5mm NDS 2.6mm DS. Don't have a 2.6 but guessing a 2.5 should do the job?

Thanks,
B
2.5mm was a typo. It is 2.6mm on the DS. They are marked if thry are for the DS or NDS. The 2.5mm is flanged for the NDS and the 2.6mm is not. The 7.5mmNDS is for my 68mm shelled caad10. I think you're overcomplicating this a lot. If you have 2.6mm DS and 7.5mmNDS and it is still a little loose you just add .5mm spacers till the wave washer has compression.
I did forget about making sure the spindle is in the right direction. Checkout the cannondale diagram above.

Stage21 cycling sell all of the spacer sizes of you need some

Sent from my SAMSUNG-SM-G935A using Tapatalk

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PostPosted: Sat Aug 26, 2017 8:14 pm 
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Posts: 16
Thanks. Final question as I don't have the original Cannondale spacers. Does it matter if they're flanged or not? Is it to do with avoiding too much pressure on the bearings?
Can't seem to get my hands on those spacers from a UK retailer so may need to order from the U.S.
Thanks


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PostPosted: Sat Aug 26, 2017 9:04 pm 
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Posts: 480
Location: RVA,USA
I can't say why, but the NDS does need to be flanged, the DS is not.
https://www.stage21bikes.com/stage-21-h ... e-spacers/ is at least one place to source them from. Hope that helps!

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Posted: Sat Aug 26, 2017 9:04 pm 


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