Can I put a bigger chainring on it? Does it fit?

[dreys]

I bought a 2nd amflow spider. I’m popping down to a local engineering shop and getting 1.7 mm of material removed from the spider arms to increase the distance from the suspension arm.

Wow, I've seen crazy things, but this takes the cake.

So you're purposely making the material weaker on 120Nm bike, especially at the place where strength matters? No words on my end...

 

[Pentti]

Huh?

But at the end of the day it is your bike, you do what you want.

Thanks

 

[SimonG]

Wow, I've seen crazy things, but this takes the cake.

So you're purposely making the material weaker on 120Nm bike, especially at the place where strength matters? No words on my end...

Well now…. I assumed a force at BCD of 200NM and used force formulae to calculate 1.7mm. This reduces the bending strength by 71% but it’s the sheer force in this application that matters, this force reduces by 34%. I don’t really have time for no nothings with opinions, show me the calculations you used and the NM forces you assumed to back up your assessment.

 

[dreys]

Well now…. I assumed a force at BCD of 200NM and used force formulae to calculate 1.7mm. This reduces the bending strength by 71% but it’s the sheer force in this application that matters, this force reduces by 34%. I don’t really have time for no nothings with opinions, show me the calculations you used and the NM forces you assumed to back up your assessment.

I'll go ride a bike and enjoy trails while you're working on improving your keyboard engineering skills.

Don't forget to add additional 0.0021mm to fit 40t chainring. And if you'll grind down teeth on the chainring, maybe you'll fit even 42t.

 

[AF1]

Cube Stereo 140. I first fitted a 38T, then 42T and now 44T (to address personal limitations). It works fine except the algorithm throws a 504. My LBS sent a B2B request to cube for modified software a week ago. The LBS did say that 'change chainwheel size' was an option in the old Bosch dealer software. I am currently talking to a company who has the old software. Any one on here know anything about this software issue?

 

[petro1head]

Where in the software do u go to change the chainring size

 

[AF1]

Where in the software do u go to change the chainring size

Reposted from my thread "Saga continues, Cube refused to change the programming (Via LBS) to suit a 44 chainwheel, the V3 Bosch software (latest)does not permit change of Chainwheel size or gear ratio changes. I was told the old software does allow this, but having found an LBS with V3 and V2 I can confirm that its still not possible on V2. They posed the question that maybe V1 can do it, however finding an LBS with V1 is unlikely. Does anyone on here know of an LBS with a working copy of V1 in the West country?

 

[Pentti]

Where in the software do u go to change the chainring size

It's in the Amflow app on your phone, it's not in the menu on the actual bike frame.