I remember primo powerbites and pedals ripping out of the crank. I am keeping my distance from these, just like I kept my distance from the titanium cranks. I value safety over saving a couple ounces of weight. I come from a time where bikes were 40+ pounds, bikes these days are light enough for me. If you want to save weight, put your wheels and tires on a diet, that area actually makes a difference.
They look pretty good, one concern would be because they are mostly squared off and not rounded at all, they might be quite painful to hit your ankles on
No pedal boss insert? Make sure to use lots of anti-seize. Your pedals will be cold, welded into those cranks in a day if not. They did a lot of work on the power bites over the years. I would look to those for inspiration on an aluminum crank arm design and see what design upgrades they made over the years. There’s also a reason the power bites never used splines.
I'm impressed with the 24mm spline-drive adapter that's included in the package. These new cranks don't seem any lighter than 22mm SuperLites. Alloy arms without pedal inserts don't sound great on paper. Regardless, good coverage as always, Brant.
I will wait a year at least before I even consider buying these. I don't really trust the "testing" RNC does due to all of their titanium crank issues.
I did the 6” spindle length and it worked out well for my setup. And crank length kinda depends on your preference. Feels like a lot of people run between 160-170mm these days. I ride 170s but not for any particular reason
Definitely a bit of a marketing gimmick the aluminum is just a 7068-T6511 alloy. That 103 is the ultimate tensile strength too. Yeild strength or tensile strength of the alloy before permanent deformation is a better marker. End of the day that's just talking about the raw alloy, the design and application matters the most for determining the end use strength.
First off it's not 7068. It's a similar aluminum with the same tensile properties but is much more ductile and has a higher fatigue life. I didn't know sharing your tensile strength is a gimmick It's giving your potential customers data on why your product is better
Right off the bat at 1:00 you can see on the spacer that you get your aluminum from Kaiser. You didn't even bother to remove the markings from the mill. Tennalum 7068 or what is now just Kaiser 7068 is the highest performing material they offer. Your description of the alloy is the same verbiage as seen in the Kaiser documents. Where this gets interesting on the comment section (instagram) for the mechanical testing post, in a response you say the material is 7075. I guess we are just flip flopping through materials here. It becomes very hard to take things at face value. Where this becomes a gimmick or some deceptive marketing is when you use engineering terms that sound nice but really don't describe the end use characteristics that matter. For example ultimate tensile vs yield. Not to mention the load cases seen under use are much more important when assuming at a base that these are at least 7 series. Sure the average joe won't know but as an engineer I do. In terns of the mechanical testing, you are rigging up a load cell with a digital display on a press. I understand it is not always feasible to get access to a UTM but 1000 something pounds of force loaded statically is not how these cranks will be loaded in the field. Also a raw force number here means little without understanding the rate in which the load is applied. It's quite unlikely that you are able to keep the load rate consistent without a UTM. Dynamic loading best represents real life conditions which is how they need to be tested. I don't even need to expand on how a hard chromolly pedal spindle threading into aluminum threads many times over the useful life of the components is undesirable. End of the day there is significant room for improvement on this product and they are not at a point where they provide many advantages over chromolly cranks.
@@RockyPondProductions 7068 is not their highest performing alloy. I spent hours on the phone with their engineers. Go do your research before you spew misinformation
@@rncbmx2456 Several hours on the phone was probably needed seeing how you can't keep the materials straight. In the comments it's 7075 and in the marketing it is super secret proprietary aka 7068. Only disinformation is your flip flopping. Look you can market your inconsistently applied static 1000 ponds on the press but at the same time you also have to be ready for people with knowledge about engineering pushing back against your claim. Especially since it doesn't actually provide any real empirical evidence about real world load cases. If you are going to put out a part and charge more than a frame you better be able to handle people looking into things like this. It is alot of money to spend on a part and if it doesn't pass the sniff test people are not going to take it seriously. Look I mean this with no offense but there has been quality problems with your components. As an engineer I totally get the problems and difficulties, it is not easy but there are design choices or data presented in a way that shows some lapses that can't be ignored. Hopefully some of these things can be improved upon.
I have no problems keeping materials straight. I made prototypes out of 7075 to prove out all my manufacturing processes while I was waiting for my mill run of the other material
Rnc is gimmick I've seen several of the products in person and very unimpressed. The engineering, designs and machining are all sub par. It's clear that it's just a guy with no particular expertise producing this stuff.
@@kirkwickham3336So all the other videos of the ti cranks snapping, cracking, and the press fit end slipping is user error? Ya, ok. I would rather just buy chromoly cranks that I know wont break no matter how I install them/treat them.
I remember primo powerbites and pedals ripping out of the crank. I am keeping my distance from these, just like I kept my distance from the titanium cranks. I value safety over saving a couple ounces of weight. I come from a time where bikes were 40+ pounds, bikes these days are light enough for me.
If you want to save weight, put your wheels and tires on a diet, that area actually makes a difference.
They look pretty good, one concern would be because they are mostly squared off and not rounded at all, they might be quite painful to hit your ankles on
Aye
I have the old first design RNC cranks, and that was my biggest complaint. The square edges were so harsh I would wear a ankle guard just to ride them
Interesting to see how long the pedal's thread will last.. original powerbite cranks didn't have crmo inserts as well..
Pretty cool, can't wait to see the results after you ride them
No pedal boss insert? Make sure to use lots of anti-seize. Your pedals will be cold, welded into those cranks in a day if not. They did a lot of work on the power bites over the years. I would look to those for inspiration on an aluminum crank arm design and see what design upgrades they made over the years. There’s also a reason the power bites never used splines.
I've blown out the splines on chromoly bmx cranks and ripped pedals right out of mtb aluminum cranks, so these seem a little sketchy to me
Not to mention the titanium cranks had all kinds of issues.
I swear i saw these on that E-Bike that has a driven drive belt a few months back
When are you gonna cut that 2010 beiber cut?
Never man don’t hate on a man’s hair no hair is outta style just
When you create and build a channel that's as successful as what Brant has.
It’s his signature man! it would be like Mr. T getting rid of the necklaces.
When are you gonna grow up and stop teasing people? 🤷
NEVERRRRR
Just so people like you can keep whining about if nothing else
i have a pair of eclat mavericks seems kinda similar
Very nice!
I'm impressed with the 24mm spline-drive adapter that's included in the package. These new cranks don't seem any lighter than 22mm SuperLites. Alloy arms without pedal inserts don't sound great on paper. Regardless, good coverage as always, Brant.
Very awesome
Just curious what length Spindle did you order? Also, any coupon codes for RNC?
I will wait a year at least before I even consider buying these. I don't really trust the "testing" RNC does due to all of their titanium crank issues.
What's the length and spindle length best option for park riding for those ?
I did the 6” spindle length and it worked out well for my setup. And crank length kinda depends on your preference. Feels like a lot of people run between 160-170mm these days. I ride 170s but not for any particular reason
@Brant_Moore thanks brant love your videos man keep up the good work and content just order a set of those legs see how they work out
Wanted to invest in the ti cranks, but now... hmmm 🤔 😅
Definitely a bit of a marketing gimmick the aluminum is just a 7068-T6511 alloy. That 103 is the ultimate tensile strength too. Yeild strength or tensile strength of the alloy before permanent deformation is a better marker. End of the day that's just talking about the raw alloy, the design and application matters the most for determining the end use strength.
First off it's not 7068. It's a similar aluminum with the same tensile properties but is much more ductile and has a higher fatigue life. I didn't know sharing your tensile strength is a gimmick It's giving your potential customers data on why your product is better
Right off the bat at 1:00 you can see on the spacer that you get your aluminum from Kaiser. You didn't even bother to remove the markings from the mill. Tennalum 7068 or what is now just Kaiser 7068 is the highest performing material they offer. Your description of the alloy is the same verbiage as seen in the Kaiser documents.
Where this gets interesting on the comment section (instagram) for the mechanical testing post, in a response you say the material is 7075. I guess we are just flip flopping through materials here. It becomes very hard to take things at face value.
Where this becomes a gimmick or some deceptive marketing is when you use engineering terms that sound nice but really don't describe the end use characteristics that matter. For example ultimate tensile vs yield. Not to mention the load cases seen under use are much more important when assuming at a base that these are at least 7 series. Sure the average joe won't know but as an engineer I do.
In terns of the mechanical testing, you are rigging up a load cell with a digital display on a press. I understand it is not always feasible to get access to a UTM but 1000 something pounds of force loaded statically is not how these cranks will be loaded in the field. Also a raw force number here means little without understanding the rate in which the load is applied. It's quite unlikely that you are able to keep the load rate consistent without a UTM. Dynamic loading best represents real life conditions which is how they need to be tested.
I don't even need to expand on how a hard chromolly pedal spindle threading into aluminum threads many times over the useful life of the components is undesirable.
End of the day there is significant room for improvement on this product and they are not at a point where they provide many advantages over chromolly cranks.
@@RockyPondProductions 7068 is not their highest performing alloy. I spent hours on the phone with their engineers. Go do your research before you spew misinformation
@@rncbmx2456 Several hours on the phone was probably needed seeing how you can't keep the materials straight. In the comments it's 7075 and in the marketing it is super secret proprietary aka 7068. Only disinformation is your flip flopping. Look you can market your inconsistently applied static 1000 ponds on the press but at the same time you also have to be ready for people with knowledge about engineering pushing back against your claim. Especially since it doesn't actually provide any real empirical evidence about real world load cases. If you are going to put out a part and charge more than a frame you better be able to handle people looking into things like this. It is alot of money to spend on a part and if it doesn't pass the sniff test people are not going to take it seriously.
Look I mean this with no offense but there has been quality problems with your components. As an engineer I totally get the problems and difficulties, it is not easy but there are design choices or data presented in a way that shows some lapses that can't be ignored. Hopefully some of these things can be improved upon.
I have no problems keeping materials straight. I made prototypes out of 7075 to prove out all my manufacturing processes while I was waiting for my mill run of the other material
Rnc is gimmick I've seen several of the products in person and very unimpressed. The engineering, designs and machining are all sub par. It's clear that it's just a guy with no particular expertise producing this stuff.
I've been running his Superlite cranks for about 8 months now and am very impressed.
Last time I listened to this homeboy Pimpin these drinks I wasted five hundred bucks on a pile of junk titanium🤔👎
@@kennyfoster4733 Likely a user error during installation.
@@kirkwickham3336So all the other videos of the ti cranks snapping, cracking, and the press fit end slipping is user error? Ya, ok. I would rather just buy chromoly cranks that I know wont break no matter how I install them/treat them.
The press fit end existed for maybe 5 pairs of cranks and rnc went back to welding immediately after there was an issue
Id be interested to see how he tested these cranks,especially the spline drive.