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2 votes

Aligning a Shimano direct mount derailleur

You have a normal derailleur mount (in silver: part of the frame) under the black mount. You have simply undone the wrong bolt. Take off your black part currently attached to the frame and use the ...
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  • 9,604
5 votes

Trek Marlin 7 (2022), Gear Shifting

This type of indexing issue can be particularly frustrating to try and resolve. One solution is to try and fine tune it whilst taking short rides up and down a quiet local street. Start by ...
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  • 14.6k
5 votes

combining an index shifter with a friction rear derailleur

Just to clarify what Adam wrote: The OP is correct that an indexed shifter will pull a fixed1 amount of cable per click. That's usually called the cable pull or similar. The derailleur has an ...
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  • 19.5k
7 votes

combining an index shifter with a friction rear derailleur

This probably won't work. If it does, it means you've found a lucky combination of parts and also gotten lucky setting the cable tension. You are correct that the derailleur's cable pull ratio will be ...
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  • 24.1k
4 votes

Recommendation for rear derailleur replacement for a hybrid bike

Based on the information supplied, it appears that your original rear derailleur is a Shimano Tourney RD-TY300. This is a relatively inexpensive rear derailleur, and for your purposes, I would simply ...
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  • 1,691
3 votes

Why does my rear derailleur's indexing work for either the high or the low gears, but not both?

I have had a think about the last few times I've "snapped a cable" in the handlebar's gears selector. Thinking about each of the last 3 or 4 times this has happened to me, for the preceding ...
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2 votes

Gears not shifting properly

"I decided to look at the housing and cable, and indeed the cable was completely mushed inside the shifter, so I thought great that was the issue the cable was torn apart and was causing too much ...
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  • 1,691
1 vote

Ultegra RD-R8000 derailleur chewing up shifter cable - WTH?

Cables should be changed at around 2,800 miles anyway to prevent the heads from breaking off inside the shifter. On 2 occasions that happened to me at 3,000 miles. I was thinking your cable had been ...
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2 votes

Ultegra RD-R8000 derailleur chewing up shifter cable - WTH?

There is visible damage to the derailleur: All other pictures / drawings show a U-shaped notch that guides the cable to the bolt. Half of this part is broken away, leaving a jagged edge that is ...
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  • 141
5 votes

Ultegra RD-R8000 derailleur chewing up shifter cable - WTH?

Like @Criggie says, it looks like the pinch bolt isn't assembled correctly - normally, Shimano components have a grove in the mech (and sometimes the washer) to indicate the correct cable path. My ...
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  • 51
8 votes

Ultegra RD-R8000 derailleur chewing up shifter cable - WTH?

I would check to see if there are any sharp edges at that interface where the cable is fraying. I run an 8000 RD as well and have never had a problem with cable fraying there. A sharp edge is one ...
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  • 1,691
7 votes

Ultegra RD-R8000 derailleur chewing up shifter cable - WTH?

Curious problem - it's clearly related to flexing of the inner cable at this pinch bolt. I'd be tempted to put some heatshrink cabling on a new inner cable before clamping, such that the cut end butts ...
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  • 99.2k
6 votes

Ultegra RD-R8000 derailleur chewing up shifter cable - WTH?

It is unequivocal that a bowden cable being flexed back and fourth over a sharp bend like this will eventually break it. Bowden cables have fancy engineering math for the minimum radius bend they can ...
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1 vote

GRX800 position

It took some time because I just moved to Warsaw, Poland, and had to find English-speaking shops. I found 2, and at both of them, I've been told that the only tool to check the hanger straightness is ...
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  • 153
2 votes

HELP with derailleur upgrade question

Here you replace it with the best nominally 9-speed Shimano mountain derailleur you can get. The XT-level RD-M772 is the usual culprit among ones that are available new. There's also a 9-speed Deore ...
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3 votes

HELP with derailleur upgrade question

If you want a real upgrade, my recommendation would be to upgrade not only the derailleur, but also the cassette and shifter to have a more modern system (transmission for single chainring systems, ...
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  • 6,815
1 vote

Feasibility of coupling internal hub gear and derailleur

My front wheel driven recumbent trike has been given a three speed internal hub as well as keeping its 8 cogs derailleur setup. It has a relatively wide space for the hub and the bike shop would only ...
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  • 3,264
3 votes

HELP with derailleur upgrade question

You'll need any 8 speed derailleur from Shimano or another manufacturer. As a rule of thumb, the differences between road and MTB, and differnet maker's designs only start to become an issue at 10 ...
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  • 99.2k

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