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1

You didn't say how many speeds, which is the most important parameter here. From what I googled about Trek 720 multi-track and Gripshift MRX 100, it seems your bike has a 7-speed cassette or freewheel. 7-speed cassette ideally should use 7-speed bar-end shifter, or secondarily if that's unavailable 8-speed bar-end shifter with one unused click (8 speed ...


1

The R7000 shifters are 11-speed shifters and require 11-speed pull ratio rear deraileur and 11-speed cassette. I'm not sure if your Tiagra is 4700 or earlier. If it's 4700 then despite being a 10-speed system it uses the 11-speed derailleur cable pull ratio, so it will work with 11-speed shifters provided that you use 11-speed cassette. If the Tiagra is ...


3

It sounds like you are missing an endcap. The trope is for them to get overlooked and even possibly thrown away off of a new wheel when you pull off the black plastic protective axle plugs and the endcap gets pulled off with it.


2

10-speed "MTB" shifters use a different cable pull ratio. 9-speed uses the same ratio as 8 speeds. So if you downgrade to 9 speeds (downgrade since with 8 speed you have a large jump between gears so a shift results in meaningful change in gear ratio whereas with 9 speeds you need to click...click...click a lot to get a meaningful change), you don'...


-1

This is an old thread but people looking into this topic may discover it as I did so - Those that are considering the problem described above should simply buy an R8000 rear shifter and the problem is solved. July 2021


0

What a gorgeous bike that is!! I was a senior in high school that model year and that DX-3000 was my dream bike. Especially loved the black and yellow color scheme, which was the same as my state's university who's football program at the time was emerging from decades of losing into national prominence. I rode a Panasonic Sport 500 at the time, but made ...


2

The modern Shimano cartridqe bbs are mostly symmetrical. 115mm would probably be best bet. 107 is asymmetrical as is one (or more) of the D- sizes. Axles for cup and cone (and the cups) are still available in good quality. IRD recently had Tange produce a variety of these. There are other cheaper options too.


0

Some more info: 42/32/22 refers to the gear tooth counts of the 3 chainrings that came with the crankset. 165 does indeed refer to the crankarm length, measured from crank (bottom bracket) axis to pedal axis. 165mm is on the shorter side, which makes sense since your bike has 24" wheels rather than 26" or larger wheels. When replacing crankarms, be ...


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