narrow wide oval chainrings
Rotor have launched their qx-1 ring on the new rex 1.1 crank, it has their usual wonkey shape, with thick/thin profile designed to work without a chain guide, sauser used it at Leaville 100. I’m keen to try one but don’t fancy the cost of the whole crank! so yes please make some =)Posted 4 years ago
someone off this good forum has asked me to look into making some narrow/wide type chainrings, so i have got the cad chap stuck into modelling one up and am getting costs of 7075 plate. ouch, its not cheap.
is there any point or need for oval thin/thick type chain rings? without a front mech or chain device this would be ok, but what would happen with the clutch mech?Posted 4 years agonedrapierSubscriber
I would have thought there was more need for thick/thin on wonky ring than a round one, given the difficulty of using a chain device with a wonky ring.
Clutch mech wouldn’t be affected, chain tension should be even through the rotation of the crank, as per wonky singlespeed setups, including mine.
I’d be interested in one, depending on £, obviously!Posted 4 years ago
so i got the cost of a 2m x 1m sheet – i need to get quotes for water jetting out the blanks but i think they should come in for less than the big brands are knocking them out for. For info, renthal make a 520 7075 rear sprocket for a motorbike for about 39 quid. compared to a 32t 104bcd mtb sprocket at about 45 that seems like a bargain. maybe we are used to paying too much.Posted 4 years ago
I tried Kev at Goldtec, and they’ve canned their wonkey thick/thin ring due to it overworking the clutch in type 2 mechs, adding extra resistance to the crank, i’m about to try a normal wonkey ring with my current x9 type2 mech so i can report back, but it makes sense from how he explained it 🙂
edit: they will work with xx1 as the clutch is different, so probably still worth it, as rotor have their qx-1 ringsPosted 4 years agoNorthwindSubscriber
porter_jamie – Member
For info, renthal make a 520 7075 rear sprocket for a motorbike for about 39 quid. compared to a 32t 104bcd mtb sprocket at about 45 that seems like a bargain.
Volumes, Renthal make a pretty good percentage of all the world’s aftermarket sprockets, of which there are many…
Oh when price comparing with renthal mtb bits remember they’re hard anodised- I couldn’t say how effective it is on pushbikes but on the motorbike rings it’s about a 50% lifespan increase over “plain” alu rings.Posted 4 years ago
the thick/thin makes no difference, its the wonkey ring profile which makes the clutch cause drive resistance, i didn’t explain it that well. He said that using a x-9 9 speed make on the normal non thick/thin worked lovely. But xx-1 mechs have a less fierce clutch and have less drive resistancePosted 4 years ago
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