I'll take a tubeset for a frame build. K, thanks. Where do I send my money?hambini wrote: ↑Thu Jan 10, 2019 7:45 amprobertsqbe wrote: ↑Wed Jan 09, 2019 9:24 pm
Hambini just picked up on your comment re your development of hubs. I couldn’t see any listed on your website. Are there anymore details you could share or pm me a link?
One of the developments in material technology is a material called superlight. It's an Aluminium alloy with hexagonal crystalline construction. This is about 50% lighter than normal aluminium and almost all of the tensile strength. I have made a couple of these for test purposes for some of the pro cycling teams I supply.
I do not supply them on the open market yet and the manufacturing process to make them is currently hideously expensive and time-consuming.
Hope that helps
Hambini
Best Groupset in your opinion
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Appalling.
Hambini Aeronautical Engineer, Polluting YouTube since 2016 - views expressed are my own...
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The best shouldn't that be the most reliable?
Or is it the highest degree of precision?
It's debatable and probably subjective.
Or is it the highest degree of precision?
It's debatable and probably subjective.
Bikes:
Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
Campagnolo EPS SR V3
I'm going to go a bit crazy here and say the best groupset is 105 as a whole; but one could go with a Ultegra rear derailleur to put the cherry on top. You're only giving up about 190 grams in weight to the Ultegra (not including the swap to the Ultegra rear on a 105 setup), but you're saving about $400 (again not including the Ultegra rear). Switching the rear derailleur from 105 to Ultegra will save you about 25 grams and cost you about $40 more, but the Ultegra rear is just a wee bit smoother and wee bitquicker operating derailleur but it supposedly uses better internal components to make it last longer, for $40 I think it's worth it. I would also use DA cables instead of standard Shimano cables, the cables will make the biggest difference in how smooth 105 will operate; with 105 and DA cables you would be hard press to tell the difference between 105 and even DA!
I personally don't think DA is worth buying at all unless your racing and a sponsor is paying for you to have it. Most people can't even tell the difference between 105 and Ultegra
I personally don't think DA is worth buying at all unless your racing and a sponsor is paying for you to have it. Most people can't even tell the difference between 105 and Ultegra
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I'm a huge fan of electronic shifting so I would say newest gen Di2.
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Hmm... interesting. But i am guessing there is more to it.hambini wrote: ↑Thu Jan 10, 2019 7:37 am
I meant the 1mm length of the 24mm bit on GXP. Diameter does not vary by 1mm but it's still ~0.075mm versus Shimano which is around 0.025mm. Non drive side is fixed so the adjustment is by shims and the take up is on the wave washer.
Sample size is over 20 that I've measured and at least 35 that users have measured (for the length). For the diameter it's only the one's I have measured. I used to ask for this measurement before making BB's. I have since stopped making SRAM GXP BB's
So you measured 20 or so? What was the variability of red vs say apex?
No question that the japanese have a reputation for precision. Also interesting that shimano sora vs dura ace are also all equally precise in machining consistency.
What are sram bb30 tolerences like? Dub (agreed with the prior poster with the irony of that)? I presume sram upped their precision game with dub.
Precision is a choice, and is directly related to cost. Drops in precision are usually related to hitting lower manufacturing price points (or higher profit margins).
How critical is the accuracy of the bit(i assume you mean spindle length)? Maybe it was a concous cost cutting measure, given length (or even diameter) is not mission critical. Why be precise when there is even larger variability in the frames themselves? Most require spacers anyway. Again, maybe sram chose not to be precise here because the frame accuracy across an industry was kind of crap... and it would be a drop in a bucket.
Also, i think the sram spindles are press-fit into the cranks. Those machining tolerances must be very tight for retention. As such, the bit length variation may be a result in differences in seating. The actual lengths may be pretty consistent.
Maybe another component in a groupset would be a better indicator of quality. I presume chain, casette, and chainring tolerances are probably the most important. I know shimano chains are the best in my mind.
I also presume that the standard of machining tolerances improve as you go up in groupset price (red > apex). Doesn’t shimano do xt/ultegra/da/xtr in japan, and the rest elsware? I wonder if sram does their groupsets in different factories. That might account for variability.
I still suspect shimano wins on precision on things like casettes/chains/chainrings. No question they shift well. Still prefer my etap functionality and design, and i do have both. For offroad, i have been very happy with 1x mechanical xtr however.
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8050 or 8070
Power crank of your choice and party on.
Power crank of your choice and party on.
Using Tapatalk
I'm not really commenting on the shifting because it's open to interpretation but in hard numbers the variance on SRAM is high. It's generally IT10 on the tolerance class, where Shimano is IT7. Campag is around IT8-9RocketRacing wrote: ↑Mon Jan 14, 2019 4:52 amHmm... interesting. But i am guessing there is more to it.hambini wrote: ↑Thu Jan 10, 2019 7:37 am
I meant the 1mm length of the 24mm bit on GXP. Diameter does not vary by 1mm but it's still ~0.075mm versus Shimano which is around 0.025mm. Non drive side is fixed so the adjustment is by shims and the take up is on the wave washer.
Sample size is over 20 that I've measured and at least 35 that users have measured (for the length). For the diameter it's only the one's I have measured. I used to ask for this measurement before making BB's. I have since stopped making SRAM GXP BB's
So you measured 20 or so? What was the variability of red vs say apex?
No question that the japanese have a reputation for precision. Also interesting that shimano sora vs dura ace are also all equally precise in machining consistency.
What are sram bb30 tolerences like? Dub (agreed with the prior poster with the irony of that)? I presume sram upped their precision game with dub.
Precision is a choice, and is directly related to cost. Drops in precision are usually related to hitting lower manufacturing price points (or higher profit margins).
How critical is the accuracy of the bit(i assume you mean spindle length)? Maybe it was a concous cost cutting measure, given length (or even diameter) is not mission critical. Why be precise when there is even larger variability in the frames themselves? Most require spacers anyway. Again, maybe sram chose not to be precise here because the frame accuracy across an industry was kind of crap... and it would be a drop in a bucket.
Also, i think the sram spindles are press-fit into the cranks. Those machining tolerances must be very tight for retention. As such, the bit length variation may be a result in differences in seating. The actual lengths may be pretty consistent.
Maybe another component in a groupset would be a better indicator of quality. I presume chain, casette, and chainring tolerances are probably the most important. I know shimano chains are the best in my mind.
I also presume that the standard of machining tolerances improve as you go up in groupset price (red > apex). Doesn’t shimano do xt/ultegra/da/xtr in japan, and the rest elsware? I wonder if sram does their groupsets in different factories. That might account for variability.
I still suspect shimano wins on precision on things like casettes/chains/chainrings. No question they shift well. Still prefer my etap functionality and design, and i do have both. For offroad, i have been very happy with 1x mechanical xtr however.
In general, if you move up and down in the groupset range, the tolerances seem to stick. So 105 is still IT7 like Dura Ace but with a weight penalty. The country of manufacture doesn't seem to affect the tolerance range. Malaysia or Japan, both are consistent.
This doesn't affect cranks only. Measuring the positions of pins and bearing locations is much more consistent on Shimano than SRAM. There is day and night difference.
My conclusion is Shimano's manufacturing engineering expertise is the best in the groupset industry. They are very precise and repeatable.
Hambini Aeronautical Engineer, Polluting YouTube since 2016 - views expressed are my own...
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What real life consequences is this likely to have Hambini?
I'm about to pull the trigger on a groupset and was set on Sram, people I've spoken to at my club can't speak highly enough of it.
I have read that in comparison tests Shimano shifts that bit quicker / crisper than Sram. Is that likely to be because of the tolerance class differences?
I'm about to pull the trigger on a groupset and was set on Sram, people I've spoken to at my club can't speak highly enough of it.
I have read that in comparison tests Shimano shifts that bit quicker / crisper than Sram. Is that likely to be because of the tolerance class differences?