If there is a lot of hay made about bigger pulley wheels, then why don’t large chain ring/large cassete options exist? For instance, a 60t sprocket can be paired with a 12t cassette gear for a super long 5.0 ratio. You’d have to accept a 1x, but barring that, wouldn’t the more gradual chain angles be beneficial, or would it be marginal?
They do, this is what I put on my TT bike. I assume it’s marginal in the same way. There’s no need for an 11t at that ratio, especially when that’s known to be inefficient. With a 12t top end instead of 11t, you then gain a gear more towards the middle, a 16t or 18t depending on the cassette, which smooths out the gaps between gears–larger in absolute terms due to the 60t, but still the same relative differences as a normal front ring. With a 12-25t for perfectly flat FL courses, I have a straight run from 12t to 19t, which is pretty good.
I even looked at a 60t x 14-28t junior cassette as an option, but the top end on that was equivalently a 53x12.5t or so, which was too small.
A 58 is pretty common there just aren’t that many 60s floating around. My guess is going from 58 to 60 is a tiny reduction in friction but getting up even a modest hill with a 23 or 25 could really hurt. I don’t get your desire for a 12. You really want your most likely used gear to give you a straight chain line. Whatever that takes would be priority number 1 for me, but spinning out a 60x12 in a tail wind would be really frustrating knowing that a 11 was a viable option. Of course I get to race at altitude, so needing an 11 for a breezy TT is not unreasonable.
A 58 is pretty common there just aren’t that many 60s floating around. My guess is going from 58 to 60 is a tiny reduction in friction but getting up even a modest hill with a 23 or 25 could really hurt. I don’t get your desire for a 12. You really want your most likely used gear to give you a straight chain line. Whatever that takes would be priority number 1 for me, but spinning out a 60x12 in a tail wind would be really frustrating knowing that a 11 was a viable option. Of course I get to race at altitude, so needing an 11 for a breezy TT is not unreasonable.
My thinking is that going from a 10 or 11 tooth cog to a 12 would be more efficient, in the same way increasing pulley wheel sizes is more efficient. And yes, you would need at least a 30t ring in the cassette.
I ride a 60-18 on my track bike and it’s enough gear to roll comfortably at 23-24 mph
A 60-14 at 90 rpm is 30 mph which would take me about 5.5 to 6 W/Kg to do, perhaps you like a cadence in the 70’s or are much stronger than I am.
You’d have to accept a 1x
Not if you try hard enough.
60t chainrings for sure exist, but you run into fit problems. Bigger chainrings start running into chainstays. There’s also the trade-off of drivetrain efficiency of larger rear cogs to aerodynamic benefits of smaller chainrings.
Preferred cadence is 80 rpm in training and closer to 90 rpm while racing. The setup is really to squeeze efficiency out of tailwind sectors and maintain leg speed without dropping to 11t. Today, for example, did an 8-mile TT at 27mph / 4.5 W/kg, and spent almost 8 minutes over 30 mph.
Chainline/routing is a marginal gain, to be sure, but if it gets me a couple watts I’ll take it.
That’s fair.
They can pry my 12-25 from my cold dead hands.
I live in Raleigh. Routinely a TT training ride is 60 feet per mile. 54T and 12-25…at 100 rpm. No problem.
I think since your cadence is so low, a 60T spells trouble as you have less breadth of range in usable cadence.
I have 70 to 105 or so. You’re starting at 80.
I think the Ultegra11-32 with a 58/42 front and GS cage was the best I could come up with and just not going down into the 11, you lose some spacing but get better overall radius turns on your usable range without shifting too far from the ratios of a more conventional 52/36 and 11-28 setup.
If there is a lot of hay made about bigger pulley wheels, then why don’t large chain ring/large cassete options exist? For instance, a 60t sprocket can be paired with a 12t cassette gear for a super long 5.0 ratio. You’d have to accept a 1x, but barring that, wouldn’t the more gradual chain angles be beneficial, or would it be marginal?
60x15 or 60x17 or 60x18 would be better. The bigger the rear cog the better.
60x18 is the same as 54x16 IIRC.
If there is a lot of hay made about bigger pulley wheels, then why don’t large chain ring/large cassete options exist? For instance, a 60t sprocket can be paired with a 12t cassette gear for a super long 5.0 ratio. You’d have to accept a 1x, but barring that, wouldn’t the more gradual chain angles be beneficial, or would it be marginal?
I’ve said this since SRAM started their push for smaller gears. A 58-60T 1x with a 12-40/42 would give you the same if not slightly more range with reduced friction. The only downside would be the extra weight gained.
A 58 is pretty common there just aren’t that many 60s floating around. My guess is going from 58 to 60 is a tiny reduction in friction but getting up even a modest hill with a 23 or 25 could really hurt. I don’t get your desire for a 12. You really want your most likely used gear to give you a straight chain line. Whatever that takes would be priority number 1 for me, but spinning out a 60x12 in a tail wind would be really frustrating knowing that a 11 was a viable option. Of course I get to race at altitude, so needing an 11 for a breezy TT is not unreasonable.
I got what you neeeed. 
https://www.pyramidcycledesign.co.uk/ I have one of Mark’s 1x 60t rings and it’s great! Maybe a touch heavy but I don’t expect to go climbing with a 60t 1x anyway.