I use (and race) with a 3/32" 51mm ring on my LeJeune track bike. I use the Adapteur, though:
http://s183.photobucket.com/
Having said that, I'm certain that if the chain line were straight (say within 1 or 2 millimeters of being perfect) it would make no difference asto whether or not you used an "ordinary" ring or the Adapteur; or whether you were using 3/32" or 1/8" rings.
Note to Jerry Moos: On this bike, I have really small stainless steel washers between the Dome Nuts and the ring. I _think_ they're #8, but I don't recall off hand. In any event, I bought them from West Marine.
Cheers,
Fred Rednor - Arlington, Virginia (USA)
> From: Wesley Gadd <wesleygadd@sbcglobal.net>
\r?\n> Subject: Re: [CR]TA Pro 5 Vis on Fixed Wheel?
\r?\n> To: "Jerome & Elizabeth Moos" <jerrymoos@sbcglobal.net>, "Longleaf Bicycles" <longleafbicycles@gmail.com>, classicrendezvous@bikelist.org
\r?\n> Date: Thursday, August 7, 2008, 3:19 PM
\r?\n> I've been using this set for fixed gear for years. I
\r?\n> have a range of inch pitch rings (21, 22 and 24 teeth) as
\r?\n> well as a 50 tooth 3/32 single ring. The inch pitch rings
\r?\n> are beefy as hell, but I really don't notice any flex
\r?\n> with the much thinner single 3/32 ring. For me, bothersome
\r?\n> flex manifests itself as the chain rubbing on the front
\r?\n> derailleur, a moot point in this case.
\r?\n> There were indeed track adapteurs for both 3 and 5 pin
\r?\n> cranks. I always thought a 3 pin adapteur on a steel Campy
\r?\n> Gran Sport crank would be a great fixed setup!
\r?\n>
\r?\n> Best regards,
\r?\n> Wes Gadd
\r?\n> Unionville,CT
\r?\n>
\r?\n> Jerome & Elizabeth Moos <jerrymoos@sbcglobal.net>
\r?\n> wrote:
\r?\n> TA made an absolutely bewildering variety of rings and
\r?\n> adapters to fit those arms. It is true that some believe
\r?\n> that, even for road use, the TA cranks has too much flex due
\r?\n> to the small BCD of the outer ring. I don't really think
\r?\n> the second ring does anything the stiffen things, as the
\r?\n> flexing is going to be between the outside of the outer ring
\r?\n> and its attachment to the crank arm. A track ring made for
\r?\n> 1/8 inch chain is going to be thicker and stiffer than a
\r?\n> road ring, but may still flex more than some would like.
\r?\n>
\r?\n> However, TA made a number of different "adapters"
\r?\n> which consisted of spiders which bolted to the arm in place
\r?\n> of an outside chainring. These were much thicker and stiffer
\r?\n> than an outer ring bolted direct to the arm. The chainrings
\r?\n> themselves then had a much larger BCD and bolted to the
\r?\n> adapter. Maybe the best known adapter is the Criterium
\r?\n> adapter for 151 or 152 BCD Criterium rings. These were
\r?\n> widely used In The Day by road racers and time trialists,
\r?\n> and in fact I have a book published in the 70's with a
\r?\n> photos of the great Beryl Burton using a TA Criterium
\r?\n> adapter and rings on a Jacques Anquetil frame. It might be
\r?\n> that the Criterium rings were available for 1/8 inch track
\r?\n> chain and could be used with fixed gear, although of course
\r?\n> shorter bolts would be required for attachment to the
\r?\n> adapter. One would think the shorter bolts were made, if
\r?\n> nothing else for use with a single 3/32 ring for time trial,
\r?\n> as single chainring setups were widely used for TT In The
\r?\n> Day.
\r?\n>
\r?\n> Or it may be that TA made an adapter specitically for track
\r?\n> use.
\r?\n>
\r?\n> Regards,
\r?\n>
\r?\n> Jerry Moos
\r?\n> Big Spring, Texas, USA
\r?\n>
\r?\n>
\r?\n>
\r?\n>
\r?\n> Longleaf Bicycles wrote:
\r?\n> I'm looking for some cranks for a new fixed wheel
\r?\n> project (modern frameset)
\r?\n> and I'm not excited about current (non Record) single
\r?\n> chainring crank
\r?\n> offerings.
\r?\n>
\r?\n> I have a spare set of TA Pro 5 crankarms, but have never
\r?\n> used these on a
\r?\n> fixed wheel bike. I am concerned that the lack of a second
\r?\n> ring to stiffen
\r?\n> the outer ring and the higher torque placed on the
\r?\n> drivetrain of a fixed
\r?\n> wheel bike makes the small BCD of the TA cranks unsuitable.
\r?\n>
\r?\n> Is this a misplaced concern? Has anyone tried this? I
\r?\n> don't care about a
\r?\n> little flex and while it might be silly and an
\r?\n> overestimation of my own
\r?\n> power to think I'd bend a chainring the idea gave me
\r?\n> enough pause that I
\r?\n> thought I'd ask for some advice.
\r?\n>
\r?\n> Anthony King
\r?\n> Longleaf Bicycles
\r?\n> 805 B North Fourth St..
\r?\n> Wilmington, North Carolina 28401
\r?\n> 910.341.3049 p
\r?\n> 910.341.3059 f
\r?\n> longleafbicycles.com