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#1
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Campy Mirage frankenstein shift trouble
Hi All,
I have 2007 10s Campy Mirage/Xenon QS on my son's road bike. The crank, however is not Campy. I wanted short 150mm crankarms, so I used a "Bulletproof" cheap crankset with 110 BCD rings. I used a NOS SR 34T inner ring and a 44T outer ring which I believe is a BMX ring for 3/32" chains. The front derailleur is a Compact Mirage. I chose Compact because I thought it would match the radius of the smaller rings better. The outer ring is on the think side and has no pins or ramps, so I had no expectation that shifting would be great, which of course it is not. I was about to bite the bullet and go find some "real" 110BCD rings, but during some fiddling on the stand, the chain would pretty consistently not shift down to the small ring and would skate along between the rings. I don't want to buy new rings if they won't make any real difference. But maybe a non-CT front der would help. So will real rings with pins/ramps help the skate problem down to the small ring in addition to making shifting onto the big ring easier? Or should I just hit the faces of the crankarms with a file to get the rings closer and call it a day? Will a non CT der maake any difference? Joseph |
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#2
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Campy Mirage frankenstein shift trouble
On Jun 12, 9:13 am, "
wrote: Hi All, I have 2007 10s Campy Mirage/Xenon QS on my son's road bike. The crank, however is not Campy. I wanted short 150mm crankarms, so I used a "Bulletproof" cheap crankset with 110 BCD rings. I used a NOS SR 34T inner ring and a 44T outer ring which I believe is a BMX ring for 3/32" chains. The front derailleur is a Compact Mirage. I chose Compact because I thought it would match the radius of the smaller rings better. The outer ring is on the think side and has no pins or ramps, so I had no expectation that shifting would be great, which of course it is not. I was about to bite the bullet and go find some "real" 110BCD rings, but during some fiddling on the stand, the chain would pretty consistently not shift down to the small ring and would skate along between the rings. I don't want to buy new rings if they won't make any real difference. But maybe a non-CT front der would help. So will real rings with pins/ramps help the skate problem down to the small ring in addition to making shifting onto the big ring easier? Or should I just hit the faces of the crankarms with a file to get the rings closer and call it a day? Will a non CT der maake any difference? Joseph Yes to all of the above. I've never been able to get good shifting out of a CT FD. On my CX bike, I've got a 50-34 Veloce CT crank, and I'm using a regular, pre-QS Record double FD with Veloce QS shifters, and it shifts well. In a 10s setup, you definitely want pins, as the chain is so narrow, there's nothing protruding to grab the ring. Old fogeys may say that they never needed 'em back in the day, but they did - the pins happened to be on the chain, instead. I'd start with any old (with the current clamp style) Campy FD. If you have one lying around, or can find a used one cheap, but it's the wrong clamp size, just pop the circlip off, and you can interchange the FD to different mounts. Like I say, on a double, the whole QS/non- QS thing has been irrelevant. Barring that, I'd next try a ramped/pinned outer ring designed for 10s setups. A 10s ring will actually be thicker below the teeth, with the arm interface recessed, to prevent skating. A 10s 44t outer will be difficult to find. I think TA makes them, so they won't be cheap, but will be excellent quality. Wiggle.co.uk has a 46t TA Zephyr ring for GBP33.50. |
#3
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Campy Mirage frankenstein shift trouble
A Campy triple front derailleur might do the trick, as the 30-42(-52)
road triple is close to your 34-44... JG |
#4
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Campy Mirage frankenstein shift trouble
On Jun 12, 10:24*am, Hank wrote:
In a 10s setup, you definitely want pins, as the chain is so narrow, there's nothing protruding to grab the ring. Old fogeys may say that they never needed 'em back in the day, but they did - the pins happened to be on the chain, instead. I'd start with any old (with the current clamp style) Campy FD. If you have one lying around, or can find a used one cheap, but it's the wrong clamp size, just pop the circlip off, and you can interchange the FD to different mounts. Like I say, on a double, the whole QS/non- QS thing has been irrelevant. Barring that, I'd next try a ramped/pinned outer ring designed for 10s setups. A 10s ring will actually be thicker below the teeth, with the arm interface recessed, to prevent skating. A 10s 44t outer will be difficult to find. I think TA makes them, so they won't be cheap, but will be excellent quality. Wiggle.co.uk has a 46t TA Zephyr ring for GBP33.50. I agree with the idea that you often just need a plain double front derailleur to shift doubles. If you look at the ders used on MTBs in the 46-36-26 days, they were a lot plainer and less shaped than today's triple ders. If you just need pins to avoid skating and provide a mild aid to upshift, you can add pins to a ring yourself. Get some small setscrews, like 3 or 4mm. Drill a few holes in the ring and tap them for the setscrews. Stop the tap a bit short of going all the way through - this makes the last thread tight, so the screws won't ever come loose. I did this to aid upshifting on some plain rings with STI triple (indexed) front shifting and it worked fine. Ben |
#5
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Campy Mirage frankenstein shift trouble
wrote in message
... I was about to bite the bullet and go find some "real" 110BCD rings, but during some fiddling on the stand, the chain would pretty consistently not shift down to the small ring and would skate along between the rings. The problem is that the cranks were made for a 6 or 7 speed setup with a much fatter chain. Either replace the cranks with a 9-speed or higher crank or have someone mill off 1/32" from the inner ring mounting surface. |
#6
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Campy Mirage frankenstein shift trouble
On Jun 12, 7:24*pm, Hank wrote:
A 10s 44t outer will be difficult to find. I think TA makes them, so they won't be cheap, but will be excellent quality. Wiggle.co.uk has a 46t TA Zephyr ring for GBP33.50. Those cats at wiggle won't ship to my location, so once again eBay is my friend. I got an FSA allegedly 9/10 speed 46T outer ring and a Mirage front der for less than wiggle would have taken for the TA ring. The bike had it's maiden voyage today. My son kept it in the small ring, and just sort of got used to the position and the brifters, etc. Just back and forth on the tiny road outside my house. Tomorrow we are going to the parking lot at school to get used to turns and that sort of thing. Fun! Joseph |
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