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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 10-08-12, 04:26 AM   #1
jacks1071
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Shimano Ultegra R603 gearing

I've got a new set of Shimano R603 cranks I'm planning to install on our bike.

Can anyone tell me if/where can I get a larger chainring? I want to put a 55 or 56 on it as we regularly run out of gears with an 11/52

I'd ideally like one that still has that Shimano look to it.
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Old 10-08-12, 09:48 AM   #2
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Originally Posted by jacks1071 View Post
I've got a new set of Shimano R603 cranks I'm planning to install on our bike.

Can anyone tell me if/where can I get a larger chainring? I want to put a 55 or 56 on it as we regularly run out of gears with an 11/52

I'd ideally like one that still has that Shimano look to it.
I believe this thread discusses your options...
http://www.bikeforums.net/showthread...-Tandem-Cranks
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Old 10-08-12, 10:04 AM   #3
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Whoa, 11/52 is not enough gear? You have 12" tires?
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Old 10-08-12, 11:17 PM   #4
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Whoa, 11/52 is not enough gear? You have 12" tires?
700C wheels, we like to go fast. My stoker can't keep up with my cadence and as such we run out of gears around 40mph, this is close to the limit of the single riders we train with. If I can get another 5mph or so out of it that'll be enough to crack a lot of them, especially the ones who are on compact gearing.
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Old 10-08-12, 11:21 PM   #5
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What size cranks does your stoker and captain have?

If you go 165 stoker and 175 captain that may help as well.

It will make it easier for the stoker to spin up. And harder for the captain.
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Old 10-09-12, 01:58 AM   #6
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Unfortunately, the R603 cranks only come in 170 and 175 mm lengths.

The special design of all three chainrings on the R603 (and the new single-bike Ultegra and Dura Ace cranks) is the reason why I won't buy one of these cranksets - I like more choice in my gearing.

Fortunately, TA Specialites and Stronglight are both making some specially-shaped rings that match those on the Ultegra single-bike cranks, and so should also match the R603s. However, information and availability on these options is still quite lacking. Also, you can mount any regular 130 mm BCD outer ring on the R603s using standard bolts - it won't look quite right but it should work fine.
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Old 10-09-12, 07:01 AM   #7
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Hmm. I'm not in a huge hurry as I havn't installed the cranks yet (still some life left in the existing chainrings). I got a killer deal on the Shimano cranks and didn't realise the chainring options were so limited. I might mothball these and get some Davinci cranks.
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Old 10-09-12, 10:44 AM   #8
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Jacks, per the previous thread reference provided, see this:
http://www.bikeforums.net/showthread...1#post14329184

Simple enough if you want to stick with a Shimano big ring.
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Old 10-09-12, 10:50 AM   #9
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700C wheels, we like to go fast. My stoker can't keep up with my cadence and as such we run out of gears around 40mph, this is close to the limit of the single riders we train with. If I can get another 5mph or so out of it that'll be enough to crack a lot of them, especially the ones who are on compact gearing.
You ride with single riders that can ride at 40mph? Radio Shack and Liqiugas could use these guys.
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Old 10-09-12, 10:57 AM   #10
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Hmm. I'm not in a huge hurry as I havn't installed the cranks yet (still some life left in the existing chainrings). I got a killer deal on the Shimano cranks and didn't realise the chainring options were so limited. I might mothball these and get some Davinci cranks.
daVinci's cranks are great.

I understand why a company like Shimano or Campy will design proprietary components because they feel they tie the buyer to one vendor. On the other hand as an end user I appreciate standards and try not to reward companies for avoiding them.
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Old 10-09-12, 02:09 PM   #11
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700C wheels, we like to go fast. My stoker can't keep up with my cadence and as such we run out of gears around 40mph, this is close to the limit of the single riders we train with. If I can get another 5mph or so out of it that'll be enough to crack a lot of them, especially the ones who are on compact gearing.
I love this post. I've been on the receiving end of that before, undergeared on a single with a compact trying to keep up. It's one of the reasons why I run a triple or 52/36 on my single bikes now.
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Old 10-09-12, 07:43 PM   #12
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You ride with single riders that can ride at 40mph? Radio Shack and Liqiugas could use these guys.
Sitting behind us is like drafting a truck and really is pretty easy to sit on.

The only way I'll crack some of them is if we out-gear them and they can't spin fast enough. I figure if we hurt them bad enough at the start of the rides we should have an easier journey through the hilly sections.

They murder us in the hills, we've been getting in the habit of attacking prior to the hills and the group gets back on around the top otherwise we are off the back on any half decent climbs.

Its a lot of fun :-)

I see in the link above someone suggests a dura-ace 54 - thats only another 2 teeth though and I'd feel more confident knowing someone else had already done it. I really think I want a 56 ideally, anyone know if that would cause any issues with the front shifting? We have Shimano 105 5600 shifters (triple).
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Old 10-09-12, 08:56 PM   #13
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There are both 7800 and 7900 Dura Ace 56T chainrings on eBay right now, FWIW.
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Old 10-10-12, 12:14 AM   #14
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There are both 7800 and 7900 Dura Ace 56T chainrings on eBay right now, FWIW.
Correct. More to the point it was a nudge to look at these rings.

Play with http://sheldonbrown.com/gears/ to find your desired gear/mph setup.
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Old 10-10-12, 06:31 AM   #15
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There are both 7800 and 7900 Dura Ace 56T chainrings on eBay right now, FWIW.
Wow they are expensive. Has anyone fitted the Dura Ace 7900 outer ring to an R603 crank? They are too expensive for me to buy and find it doesn't work.

I've read through the other threads linked and find people talking about this but I can't recall anyone who has done it and posted the results.

The Davinci cranks are looking better by the minute.
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Old 10-10-12, 10:43 AM   #16
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Sitting behind us is like drafting a truck and really is pretty easy to sit on.

The only way I'll crack some of them is if we out-gear them and they can't spin fast enough. I figure if we hurt them bad enough at the start of the rides we should have an easier journey through the hilly sections.

They murder us in the hills, we've been getting in the habit of attacking prior to the hills and the group gets back on around the top otherwise we are off the back on any half decent climbs.

Its a lot of fun :-)

I see in the link above someone suggests a dura-ace 54 - thats only another 2 teeth though and I'd feel more confident knowing someone else had already done it. I really think I want a 56 ideally, anyone know if that would cause any issues with the front shifting? We have Shimano 105 5600 shifters (triple).
That kind of speed it out of our league but it is nice that you have a 105 FD. It has a good steel cage and it should be able to stand some trimming to fit a larger diameter ring. I use a 105 FD just to have that nice stiff steel cage.
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Old 10-10-12, 12:24 PM   #17
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You ride with single riders that can ride at 40mph? Radio Shack and Liqiugas could use these guys.
Downhill is when you need the big ring. As I posted in another thread, I didn't think we needed anything bigger than 53-11 until racing on a mountainous course.

At Masters Nationals, we tried to attack coming down Mt Bachelor. Got a bit of seperation, but we were spinning almost 140rpm in the low 50's, and it was just too unstable to try to pedal faster.

In that admittedly rare circumstance, a 56, or even a 60 would have been handy.
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Old 10-10-12, 12:35 PM   #18
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That kind of speed it out of our league but it is nice that you have a 105 FD. It has a good steel cage and it should be able to stand some trimming to fit a larger diameter ring. I use a 105 FD just to have that nice stiff steel cage.
Here's a cheap upgrade for ya'll. I have 2 new Ultegra 6703 triple FDs with 34.9mm clamp size sitting here if anyone wants them. I switched to the braze-on FD type and using the K-Edge clamp and chain keeper, so the Ultegra FDs are not needed. Ended up with one extra that remains brand new, the other has a couple rides use only. $40/ea. PM me if interested.

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Old 10-10-12, 01:32 PM   #19
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Is the OP saying that he could ride singles off his wheel on the flat if only he had bigger gears? I've ridden my single behind some strong tandem teams, including 2 captain with a strong stoker. It's pretty hard to do. I he's talking about during descents, very shallow descents where one can gain speed by pedaling beyond 40 are rare. I've never seen one, though I understand they do exist, like on the east slopes of the Rockies. Most descents, when we hit about 35 we're faster if we stop pedaling and tuck, pedals level, knees in, flat back, chin on stem, elbows under diaphragm, stoker's head on my butt. We're gone. If there's a single that knew to be abreast of us as we went over the top, a quick swerve left and they're gone, though we usually don't do that.

The problem with trying to drop people on the flat is that power required for the lead bike goes up as the cube of the speed. So when you hit the climb, you're already cooked. Smarter to let them pass you on the climb, then sprint over the top and crush them on the descent. They can't get on because you're going 10 mph faster than they are. Then you never have to ride them off your wheel. You'll each be putting out less average power than they will on the flat, heading for the next climb. This is all, needless to say, dangerous, which is why people don't recommend racing tandems against singles, unless the singles know the routine and will stay the heck right.
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Old 10-10-12, 02:00 PM   #20
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I agree with Carbonfiberboy. We don't have the power to overcome the drag but have learned to tuck nice and tight.
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Old 10-11-12, 02:14 AM   #21
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Wow they are expensive. Has anyone fitted the Dura Ace 7900 outer ring to an R603 crank? They are too expensive for me to buy and find it doesn't work.

I've read through the other threads linked and find people talking about this but I can't recall anyone who has done it and posted the results.

The Davinci cranks are looking better by the minute.
I believe that the ridges on the 7900 and 6700 cranks are different, so that 7900 rings won't look right on 6700 cranks (and therefore also not on the R603 tandem cranks). However, I've never actually seen anyone mount this combination, so I don't know just how odd it would look.
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Old 10-11-12, 02:13 PM   #22
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Correct. It wil mount but the shape is different. Close inspection of photos somewhere like competitive cyclist will confirm.
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Old 07-12-13, 01:00 AM   #23
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need a 6503 fd 34.9 as my current is 31...what are my options

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Here's a cheap upgrade for ya'll. I have 2 new Ultegra 6703 triple FDs with 34.9mm clamp size sitting here if anyone wants them. I switched to the braze-on FD type and using the K-Edge clamp and chain keeper, so the Ultegra FDs are not needed. Ended up with one extra that remains brand new, the other has a couple rides use only. $40/ea. PM me if interested.
hi
can anyone help with suggestions
i have a new 6503fd but the wrong size for seat tube.
they are old components so its hard to find a triple for a 9 ring.

the forums i read mention a 10 ring will be fine...but my mechanic disagrees...
if anyone has a 6503 for sale or recommends an alternative appreciate links or advice
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Old 07-12-13, 04:48 AM   #24
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Hi Gazlas,

what sizes do you have? There are shims that exist for making the tube fatter to fit a bigger diameter derailler clamp band.

I haven't seen the specs but it is possible that the side plates for a "10 spd" front derailler are a bit narrower than for a "9spd" front derailler. If so you are more likely to have problems with rubbing when the chain is on a bigger angle. This might be what your mechanic is referring to. If your bike has a long chainstays this will minimise this effect.

I happen to use a 10spd front derailler with a 9spd system, however I also use a friction shifter, so I can trim to solve any problems. I can say with the deeper inner plate of the new derailler it shifts really well, but I suspect that others won't be fitting friction levers anytime soon.

Cheers,

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Old 07-12-13, 12:25 PM   #25
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I have a Shimano Dura Ace FD-7703 that I'd love to replace with the Campy Athena triple 11-speed FD, but I can't get the Athena FD to work with the Lightning crank, and non-Campy (TA) 9-10 speed chainrings. If Lightning would get around to making its 135 BCD (Campy) spider, I would have a virtual Athena crank, Campy 11-speed chainrings, the Athena FD, and I'd renoice to send this DA FD to the first tandem that asks for it!

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