Question about Shimano Cycling
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Posted on Jan 02, 2017
You can download an exploded diagram of the 7900 series STI shifters here:
You can reassemble them according to this diagram.
Posted on Jul 07, 2009
The answer is yes and no.
The 5703 shifters will work both derailleurs and match the 6603 group as they are both 10spd.
The Tiagra will not work because it is 9spd, it will functionally shift the derailluer but you will not be able to line up the gearing.
The rear shifter needs to match the number of gears on the back (cassette) in the case of the 6603 group that is 10spd, so you can use any 10spd rear shifter from shimano. The Tiagra is either an 8spd or 9spd depending on the model and will not work with the cassette. You can use a 6603 rear derailleur with a Tiagra group, as long as the shifter and cassette are both the same.
Posted on Dec 14, 2010
SOURCE: Is there are barrel adjustment
Barrel adjusters on road bikes are usually where the cable enters the cable stop at the top of the down tube. They're for ON-THE-FLY adjustment trimming, not overall adjustment.
You need a basic adjustment...
Posted on Apr 13, 2011
It is apparently critical for the success of the pairing operation that initial power-up of the component to be paired be done cleanly, with little or no contact bounce when the battery is inserted. Since this is done with low power high frequency radio signals, interference and reflections can be an issue. If you have extraneous gear such as metal water bottle brackets mounted near the system controller / battery pack, remove it for this operation. Do not let anyone play with R/C toys within 30 feet while you are doing the pairing, and turn off Bluetooth devices to be really sure.
The graphics shown in the SC-7900 supplemental manual imply that the right and left shift levers are separate devices, but they are powered from the same battery and connected to the system at a single point. While Shimano's online documentation on this is rather sparse, the Di2 7900 system description says the system logic and communication circuits are inside the front derailleur. I do not expect step 6 will be needed. If you go through step 6 and it doesn't work you may need to disconnect the shift levers individually and try again. Once a device is paired, you should not have to disconnect it or remove power from it to continue the process with other devices.
If none of this works to pair your shifting system with the SC-7900, then the wireless circuitry in the shift system is defective (as I mentioned previously, this is probably in the front derailleur). Even if it is out of warranty, you may be able to get a warranty replacement since it is a newly discovered defect that could have existed from the factory. You will probably have to talk directly to the Shimano service department for this.
Posted on Jun 11, 2011
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