Unfortunately Peter White lists only a relatively few odd-toothed chainwheels anymore, and none for the TA Cyclotourist (grrrr...). (Source: https://www.peterwhitecycles.com/tach.php accessed 2025-Oct. 20 at 12:00 PDT)
But first, a summary: Bolt # # | Bolt # # Circle Teeth Chainrings | Circle Teeth Chainrings ------- ------ ------------- | ------- ------ ------------- 74 mm 31 1 | 130 mm 39 9 | 130 mm 41 2 80 mm 31 1 | 130 mm 47 1 80 mm 33 1 | 130 mm 51 4 | 130 mm 53 5 90 mm 29 2 | 130 mm 55 1 | 130 mm 61 1 110 mm 33 3 | 110 mm 35 1 | 135 mm 39 14 110 mm 39 4 | 135 mm 41 1 110 mm 45 1 | 135 mm 51 1 110 mm 47 3 | 135 mm 53 3 110 mm 51 2 | 110 mm 53 4 | 144 mm 41 1 | 144 mm 47 1 120 mm 39 1 | 144 mm 51 1 | 144 mm 53 1 TA Cyclotourist 0 Most important to me are the 110 / 74 mm chainrings and the TA Cyclotourist chainrings. TA used to produce odd-toothed rings throughout cyclotourist range, but alas, no longer -- so I'm out of luck there. Here is a comprehensive list of all TA chainrings Peter currently has in stock. Note that it is here you can see inner vs. middle vs. inner and doubles vs. triples. TA Odd-Toothed Chainrings: for SHIMANO GRX-2 X110 and X80 chainrings are for Shimano 12 speed "Gravel" cranksets. Part Number Description Price TAPL480801G9-31 TA GRX-2 X80 Inner Black 31 teeth 10-11-12 speed $42.00 X110-12 and X80-12 chainrings are for Shimano 12 speed road cranksets. Part Number Description Price TAPL49110369-49 TA X110 12V Outer Position 12 speed 49 teeth black $94.00 TAPL49110169-33 TA X80 12V Inner Position 12 speed 33 teeth black $50.00 Part Number Description Price TAX110EXT53B TA X110 Outer 11 speed 53 teeth black $94.00 TAX110IN33B TA X110 Inner 11 speed 33 teeth black $50.00 TAX110IN39B TA X110 Inner 11 speed 39 teeth black $50.00 Ovalution X110 Chainrings for 4 Arm Shimano 11 Speed Dura Ace 9000, Ultegra 6800 and 105 5800 Cranksets (Must be used as a pair.) Part Number Description Price TAPL-48110189-36 TA Ovalution X110 inner 10/11s 35 teeth black $75.00 for CAMPOGNOLO 110mm Nerius 11 Speed Chainrings for Campagnolo Compact Cranksets TA110NER1139G TA Nerius 11 110mm inner 39t grey $54.00 TA110NER1153G TA Nerius 11 110mm Outer 53t grey $94.00 110mm Nerius 9 or 10 Speed Chainrings for Campagnolo Compact Cranksets TANER39B TA Nerius 10 110mm inner 39t black Campy compat $54.00 TANER39S TA Nerius 10 110mm inner 39t silver Campy compat $54.00 TANER49S TA Nerius 10 110mm outer 49t silver Campy compat $82.00 TANER53B TA Nerius 10 110mm outer 53t black Campy compat $82.00 Campagnolo Carbone 4 bolt Cranksets (Carbone cranks have a 112mm inner bolt circle, and 145mm outer bolt circle) Part Number Description Price TAPL-48112109-39 TA X112 for Campy Carbone inner 39t grey $54.00 TAPL-48145309-53 TA X145 for Campy Carbone outer 53t grey $94.00 GENERAL CHAINRINGS FOR COMPACT CRANKSETS 110mm Syrius 11 Speed Chainrings for Compact Cranksets Part Number Description Price TASYR1139B TA Syrius 11 110mm 39 teeth black $60.00 TASYR1153B TA Syrius 11 110mm 53 teeth black $88.00 110mm Zephyr Chainrings for Compact Double Cranksets and Triples Part Number Description Price TA110MID33B TA Zephyr 110mm inner 33 teeth black $45.00 TA110MID33S TA Zephyr 110mm inner 33 teeth silver $45.00 A110MID39B TA Zephyr 110mm middle 39 teeth black $54.00 TA110MID39S TA Zephyr 110mm middle 39 teeth silver $54.00 TA110EXT45B TA Zephyr 110mm outer 45 teeth black $66.00 TA110EXT49B TA Zephyr 110mm outer 49 teeth black $66.00 TA110EXT49S TA Zephyr 110mm outer 49 teeth silver $66.00 TA110EXT51B TA Zephyr 110mm outer 51 teeth black $66.00 TA110EXT51S TA Zephyr 110mm outer 51 teeth silver $66.00 TA110EXT53B TA Zephyr 110mm outer 53 teeth black $66.00 TA110EXT53S TA Zephyr 110mm outer 53 teeth silver $66.00 GENERAL 130 BOLT CIRCLE CHAINRINGS Ovalution 130mm for Road Double Cranksets (Must be used as pairs) Part Number Description Price TAPL-58130189-41 TA Ovalution 130mm inner 10/11s 41 teeth black $45.00 Alize 130mm Chainrings for Road Double and Triple Cranksets Part Number Description Price TA130EXT51B TA Alize 130mm outer 51 teeth black $66.00 TA130EXT51S TA Alize 130mm outer 51 teeth silver $66.00 TA130EXT53B TA Alize 130mm outer 53 teeth black $66.00 TA130EXT53S TA Alize 130mm outer 53 teeth silver $66.00 TA130EXT55S TA Alize 130mm outer 55 teeth silve $74.00 TA130EXT61S TA Alize 130mm outer 61 teeth silver $74.00 Inner for Double Crankset Part Number Description Price TA130IN39B TA Alize 130mm inner 39 teeth black $51.00 TA130IN39S TA Alize 130mm inner 39 teeth silver $51.00 Middle for Triple Crankset Part Number Description Price TA130MID39B TA Alize 130mm middle 39 teeth black $58.00 TA130MID39S TA Alize 130mm middle 39 teeth silver $58.00 TA130MID41S TA Alize 130mm middle 41 teeth silver $60.00 Alize K Tripleizer Middle Chainring (accepts a 74mm inner chainring) Part Number Description Price TA130K39S TA Alize K+ 130mm 39 teeth silver $94.00 Hegoa 130mm for Double Cranksets (extra machining for minimal weight) Part Number Description Price TAHEGR51 TA Hegoa 130mm 51 teeth red $75.00 TAHEGB53 TA Hegoa 130mm 53 teeth black $75.00 TAHEBS53 TA Hegoa 130mm 53 teeth silver $75.00 TAHEGR53 TA Hegoa 130mm 53 teeth red $75.00 TAHEGB39 TA Hegoa 130mm 39 teeth black $75.00 TAHEGG38 TA Hegoa 130mm 39 teeth gold $75.00 TAHEGR39 TA Hegoa 130mm 39 teeth red $75.00 Ultra 130 Outer for Ultegra 6700 Double 10 Speed & 6703 Triple 10 Speed Outer Only, use with Alize or Hegoa Inner Part Number Description Price TA130UL53B TA Ultra 130mm 53 teeth Black Ultegra with bolts & covers $85.00 TA130UL53G TA Ultra 130mm 53 teeth Grey Ultegra with bolts & $85.00 Spare Covers & Aluminum Bolts for Ultra 130 135 MM BOLT CIRCLE CHAINRINGS Horus 8, 9, 10 Speed for 135mm Campagnolo Double Cranksets Part Number Description Price TAHOR51B TA Horus 135mm 51 teeth Black $75.00 TAHOR53R TA Horus 135mm 53 teeth Red $75.00 HORUS 11 compatible with 11S CAMPAGNOLO 135 mm Super Record 11S/Comp Ultra 11S/Chorus 11S (2009-2014)/ Athena Alu Triple 11S 135/94 TA135HOR1153G TA Horus 11 135mm outer 53t grey $94.00 TA135HOR1139G TA Horus 11 135mm inner 39t grey $54.00 Vento for Campagnolo 135mm 8, 9, 10 speed Double & Triple Part Number Description Price TA135EXT53B TA Vento 135mm outer 53 teeth black $66.00 TA135EXT53S TA Vento 135mm outer 53 teeth silver $66.00 TA135INN39B TA Vento 135mm inner 39 teeth black $44.00 TA135INN39S TA Vento 135mm inner 39 teeth silver $44.00 TA135MID39B TA Vento 135mm middle 39 teeth black $54.00 TA135MID39S TA Vento 135mm middle 39 teeth silver $54.00 Vento K+ Middle to Convert Double Crank to Triple, also known as a Tripleizer. Includes mounts and hardware for 74mm inner. Part Number Description Price TA135K39S TA Vento K+ 135mm 39 teeth silver $94.00 TA135K41S TA Vento K+ 135mm 41 teeth silver $94.00 74 MM BOLT CIRCLE CHAINRINGS Zelito 74mm Inner for 110mm, 130mm and 135mm Triple Cranksets. Also mounts directly to any K+ middle chainring. Part Number Description Price TA74-31 TA Zelito 74mm inner 31 teeth silver $30.00 94 MM BOLT CIRCLE CHAINRINGS Inner for Double Part Number Description Price TA94INN29 TA Compact 94mm inner 29 teeth silver $42.00 TA94INN29B TA Compact 94mm inner 29 teeth black $40.00 144 MM BOLT CIRCLE CHAINRINGS Competition for Older Campagnolo Record & Super Record up to 8 speed TA144-41 TA Competition 144mm 41 teeth silver inner $63.00 TA144-53 TA Competition 144mm 53 teeth silver outer $115.00 SRAM Cross for SRAM XX, X0, X9, X7 Double Cranksets TAPL-41120309-39 TA Cross for SRAM 120mm 39 teeth black $75.00 TA CYCLOTOURIST Pro 5 Vis aka Cyclotourist Inner/Middle (no odd toothed chainwheels listed) Outer (no odd toothed chainwheels listed) On Saturday, July 26, 2025 at 4:22:29 PM UTC-7 lconley wrote: > Whenever I want odd chainring sizes, I check Peter White 1st. He carries > the TA chainrings in many BCDs. > > Laing > > On Sat, Jul 26, 2025 at 4:34 PM Patrick Moore <[email protected]> wrote: > >> This is very interesting since it uses a *stock* cassette. Must >> investigate further. >> >> I like the 45/42 option. >> >> Can one still get 45 t rings? I used to get odd-tooth-count sizes in 110 >> bcd from Sugino 30 years ago — I used both 47/44 and 48/45 combos (25” >> wheels) but I’ve not looked since. >> >> On Sat, Jul 26, 2025 at 12:05 AM Shannon Menkveld <[email protected]> >> wrote: >> >>> The Shimano 9-speed 12-36 is a half-stepper's dream cluster: >>> >>> 12-14-16-18-21-24-28-32-36 >>> >>> Makes for a 7-9% half step with any of: >>> >>> - 48/45 (107 - 33.4 inches) >>> - 45/42 (100" - 31.2", probably what I would build. 45t chainrings >>> are limited to 110 bcd, so far as I can tell.) >>> - 42/39 (29" - 93.6", best bet for a 130 or 135 road crank.) >>> >>> Similar logic applies to 1.5-step and 2.5-step setups. >>> >>> The SRAM, but not Shimano, 10-speed 11-36 just adds the 11 to the >>> existing progression, giving a 112 inch high gear, at the costs of going 10 >>> speed. Not worth it, IMHO, unless I was standardizing all my bikes on 10. >>> (Which I wouldn't do, the price jump from 9 to 10 speed parts is still >>> pretty huge.) >>> >>> You do have to use a road double front derailleur, or an older triple >>> that's marked "for half step gearing" or somesuch. I know there's a Deore, >>> and there are probably others. They don't have the dropped and profiled >>> inner cage plate, which will hit the middle ring when you're upshifting. I >>> use a Suntour AR, and it works great. >>> >>> I built my HS+G because >>> >>> - I was converting a bike that I bought as an un-Drewed single speed >>> back to geared drive. >>> - I needed low gears >>> - I was cash broke and parts middle-class >>> - I had a NIB 1980 Suntour Superbe rear derailleur that I really >>> wanted to use, but its max cog and chainwrap are specc'd at 23t. >>> - All my freewheels were 1x-26 clusters >>> - I'd always wanted to try a half-step. It appealed to me, primarily >>> because duplicate gears offend my sense of rightness. >>> - I was broke >>> >>> It works a treat. The ~7% gaps are perfect, especially on the flats and >>> into the wind. And, yes, with the Rivendell Silver D/T levers, it's a lot >>> of fun to shift. (The way I do it is, from a stop, ride up on the 42 (~14% >>> jumps, not a problem when you're accelerating,) until I'm just spinning >>> just that little bit too fast. Then upshift the front and iBob's yer uncle. >>> >>> The Peugeot PKN-10 has 48/34 x 12-14-16-18-21-24-28-32, for a 28.4" - >>> 117" 2.5-step "alpine" setup. >>> >>> The GT Karakoram will get 42/34/22 x 12-14-16-18-21-24-28-32, for a >>> 92.1"-18.1" 1.5-step + granny. (I may try the double version on the >>> Peugeot, as I think it will make the big ring even more useful.) >>> >>> --Shannon >>> On Friday, July 25, 2025 at 7:27:50 PM UTC-7 Robert Tilley wrote: >>> >>>> Brompton 6 speeds are basically half-step gearing. Three speeds on the >>>> internal hub with two cogs making 6 gears spaced about 25% apart. I’ve >>>> never used a true half-step. >>>> >>>> Robert Tilley >>>> San Diego, CA >>>> >>>> >>>> Sent from my iPhone >>>> >>>> On Jul 25, 2025, at 7:13 PM, Ted Durant <[email protected]> wrote: >>>> >>>> On Friday, July 25, 2025 at 12:57:43 PM UTC-5 Patrick Moore wrote: >>>> >>>> Shannon’s post reminded me of the pleasures of half step gearing... >>>> Does anyone here use a half-stepped system? >>>> >>>> >>>> This is a timely post for me. I recently took delivery of a new >>>> Chapman "light touring" bike and, as part of the process of deciding what >>>> did that bike want to be, I worked hard on a half-step gearing setup. It >>>> turns out to be impossible to buy a cassette that works for that, so I >>>> cobbled together something from Alibaba and spent some time with it on a >>>> test bike. I'm pretty sure I'm as nerdy about gearing as anyone, and I >>>> have the Excel workbook to prove it. I am supportive of the idea of >>>> half-step and I wanted it to work. In practice, though, I didn't find it >>>> worked well for the riding I mostly do around here. >>>> >>>> My take on it is that, if you are limited to 5 or 6 cogs in back, then >>>> half-step makes sense for all the usual reasons. Like Shannon, my >>>> preference is for a 15% step between gears, just enough to be meaningful, >>>> not so much that I have to ride at a cadence that's outside my comfort >>>> zone >>>> between gears. The Shimano 9-speed 11-32 cassettes are >>>> 11-12-14-16-18-21-24-28-32, which is average steps of 14% from the 12 to >>>> the 32, with a minuscule 1.4% standard deviation among those steps. The >>>> 11-12 jump is pretty much a toss - okay, fine, I can turn it to 11 for >>>> that >>>> little extra more at 50kph. >>>> >>>> I also understand the idea of efficiency and not having any duplicate >>>> gears, but in practice my 2x9 is an 8-speed transmission with a two-speed >>>> transfer case and one extra gear at the top. I'm normally in the big ring, >>>> shifting to the small ring when facing a sustained climb of, say, 5% or >>>> more. In either ring I've got lovely, consistent 12-15% jumps between each >>>> cog. What I really care about in front is that the change between the big >>>> and small ring is around 30-35%, big enough to get me to some appreciably >>>> smaller gears, but not so big that it's a massive change in RPMs when I >>>> shift. A 42/26 combo is a giant 48% change (I use log-differences...), >>>> which is way too much for me unless I first shift the rear at least 2 >>>> cogs. >>>> Minimizing shifts is another form of efficiency, and I'm happy to use the >>>> 9 >>>> cogs in back to improve that aspect. I've learned not to grind my gears >>>> (hah) over duplicate gear combinations. >>>> >>>> With 11+ cogs in back it opens up another style of gearing, which I >>>> have on one of my Sams. The small part of the cassette is 1-tooth jumps, >>>> 11-15; the large part is 2+ jumps, 11-15%, average 13%, stdev 1.3%. This >>>> creates something of a 4-range gear setup - 1) big gears/small jumps; 2) >>>> medium gears/medium jumps; 3) medium gears/small jumps; and 4) low >>>> gears/medium jumps. Well, that's the theory. In practice I end up using it >>>> as simply high gears/low gears, and I tend to spend most time in the >>>> bigger >>>> 2/3 of the cassette. >>>> >>>> Ted Durant >>>> Milwaukee, WI USA >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "RBW Owners Bunch" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To view this discussion visit >>>> https://groups.google.com/d/msgid/rbw-owners-bunch/6577996b-ec92-4ffa-98a2-1c5748ab947en%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/6577996b-ec92-4ffa-98a2-1c5748ab947en%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "RBW Owners Bunch" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion visit >>> https://groups.google.com/d/msgid/rbw-owners-bunch/8a9eb0da-3595-4b74-86d9-6c3236aca823n%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/rbw-owners-bunch/8a9eb0da-3595-4b74-86d9-6c3236aca823n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> >> >> -- >> >> Patrick Moore >> Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum >> >> ------------------------------------------------------------------------------------------------------- >> >> Executive resumes, LinkedIn profiles, bios, letters, and other writing >> services >> >> >> ------------------------------------------------------------------------------------------------------- >> >> *When thou didst not, savage, k**now thine own meaning,* >> >> *But wouldst gabble like a** thing most brutish,* >> >> *I endowed thy purposes w**ith words that made them known.* >> >> -- >> You received this message because you are subscribed to the Google Groups >> "RBW Owners Bunch" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> > To view this discussion visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/CALuTfgsQfUipYu9NnefQoqGVATpspp%3DJLgOoJ0pHesFyFfJ-mA%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/CALuTfgsQfUipYu9NnefQoqGVATpspp%3DJLgOoJ0pHesFyFfJ-mA%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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