24
votes
What exactly is the "clutch" doing on a Shimano M8100 rear derailleur?
I'll try to answer the question of exactly how the clutch works. In essence, the Shimano clutch design uses a one-way bearing that allows the cage to freely rotate clockwise, but adds friction if ...
- 14.1k
18
votes
Accepted
What exactly is the "clutch" doing on a Shimano M8100 rear derailleur?
I assume you're talking about Shimano's 12s XT rear derailleur. For disambiguation, 8100 could also refer to the 12s Ultegra groupset. However, the Ultegra group doesn't have a clutch, and I believe ...
- 24.9k
13
votes
Did Shimano change the design of SPD cleats?
The SH71 was designed primarily to work with road versions of SPD pedals (7410 and 6500 models). SH51 and SH56 are the standard mountain bike SPD cleats and would work with all other SPD pedals. This ...
- 1,775
11
votes
Accepted
How to interpret Shimano compatibility chart?
Why are Boxes 3, 4, and 5 separate if they're all compatible with Box 1?
Boxes 3, 4, and 5 are separate because they are groupings of different types of brake calipers/types. They are separated for ...
- 5,475
11
votes
Accepted
What does this screw do (on my bicycle)?
It is called a B-screw. You can find more in the Dealer's manual for your derailleur, but basically it allows to change the angle around the pivot (related to tensioning) and the distance from the ...
- 14.6k
9
votes
Accepted
How do I find more reliable equipment for my Shimano CS-M4100, 11-42?
The M4100 is all steel, so I don't think you'll find more durable replacements. The first culprit in cassettes wear is, as you wrote, a lack of "hygiene" for the chain: a worn chain will ...
- 13.3k
9
votes
Accepted
Struggling to install Shimano CS-R8000 cassette
On Shimano Ultegra and DA-level cassettes, the biggest 3 cogs come pinned together with an integrated spacer for the smallest of the 3 cogs. The next 2 cogs are pinned, also with an integrated spacer ...
- 24.9k
9
votes
What exactly is the "clutch" doing on a Shimano M8100 rear derailleur?
On top of Weiwen Ng answer, the clutch also has another benefit. Large cassettes have a lot of inertia, when you stop pedaling (at high speeds), it keeps rotating. If the derailleur doesn't have a ...
- 13.3k
8
votes
Improving front derailleur shifting
On my mum's bike, we used an old friction shifter for the left hand. It saves alot of bother and two rings are easy -- up for high ratio and down for low ratio. Tiagra flat bar shifters exist and ...
- 12.4k
8
votes
Which direction should SH51 cleats disengage?
SH51s disengage with twisting outwards or inwards - if nothing gets in the way and you have the range of movement. However they're primarily designed for an outward twist of the heel.
It's quite ...
- 52.5k
7
votes
Can I replace hood covers on Shimano ST-2300 brake/gear levers?
I appreciate that this post is very old now but for those still searching here is an update. It is just about impossible getting the ST-2300 hoods. However ST-A070/A073 hoods fit perfectly (Shimano ...
- 71
7
votes
Is it possible to change chainrings to bigger on Shimano FC-MT500-B2 (2x10, 36T-26T)?
Maybe
It’s a 96mm BCD chainring so you might be able to purchase a compatible part e.g Shimano XT M782 40t 96mm 10-Speed. A third party 96mm ring will also be fine. You will be looking for 2x10 96BCD ...
- 4,071
7
votes
Is it possible to change chainrings to bigger on Shimano FC-MT500-B2 (2x10, 36T-26T)?
You can add a few teeth, but not enough to make a significant difference. The photo shows that the front derailleur can be moved upwards by about 0.7cm, which would be enough to add 3 teeth. The ...
- 21.2k
7
votes
What is the model of this bike?
Bike decals do not just "get lost" - someone has put effort into removing branding and evidently all the paint.
I suspect there's no serial number, and no receipts or paperwork either.
...
- 114k
7
votes
Accepted
Is a bit of disc brake rubbing normal?
Yes, 100% normal unfortunately.
I'm on to my 6th disc brake bike and all 6 have had this issue at some time or another.
- 17.8k
7
votes
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Slowly switching from Shimano to SRAM
First question: having to mess with cables every month or two is not normal. I would recommend investigating that first. If you still have the stock wheels, you can just replace the freehub body, no ...
- 13.3k
7
votes
Accepted
Improving front derailleur shifting
RD-3500 is a "road" 9-speed derailleur. Shimano "road" derailleurs up to 10 speeds (exception: GRX, Tiagra 4700, 10-speed) used the same cable pull ratio that "MTB" ...
- 15.9k
7
votes
Accepted
How did Shimano solve Boost offset in double cranksets?
Shimano chainrings are all the same regarding offset. The difference is in the cranks, which come in x100 / x120 / x130 varieties (eg. FC-M7100 vs. FC-M7120)--each of which corresponds to a different ...
- 14.1k
7
votes
Accepted
What is the purpose of non-series Shimano components?
Some are mainly meant for OEM use (i.e. for selling to bike manufacturers). This is especially true at the cheap end of the market. You can still buy bikes (or at least BSOs) with Shimano 3x6 gearing, ...
- 52.5k
7
votes
Accepted
I want to change a chainring 52 R7000 to a new 52 R8000 - will it fit?
Yes, the R8000 chainring is a direct and compatible replacement for the R7000 chainring. Shifting challenges could present themselves if the two chainrings are of a different tooth count, but being ...
- 5,475
7
votes
Accepted
Is this a long or medium cage Shimano XT 10 RD-M786-(S)GS rear derailleur?
It is a GS.
By looking at the exploded view and the stock pictures, I see that the inner plate of the SGS cage has a hole in it that the GS does not have.
RD-M786 EV:
GS:
SGS:
- 3,279
7
votes
Could I use a Shimano GRX RX400 10-speed shifter with a Shimano Dura-Ace 7900 10-speed rear derailleur?
The GRX ST-RX400 is compatible with the Tiagra RD-4700, which means it is using the 11-speed cable pull, making it incompatible with 10-speed road RD such as the Dura-Ace RD-7900.
Here is an excerpt ...
- 3,279
7
votes
Accepted
Shifter requiring to press the lever fully without resistance before engaging
I've seen this happen on slightly older thumb shifters. What happened in my case was that the grease inside the shifter had gone stiff, so the ratchet mechanism didn't spring back promptly. I still ...
- 52.5k
6
votes
Accepted
Did I mess up my front brake pressure?
It's fixable, but as well as brake oil you'll need a bleed kit. You may want to take it to a bike shop that already has one, rather than buying the tools.
There's a chance you've got oil on your (new)...
- 52.5k
6
votes
Accepted
The bicycle has Shimano M7100 chain and Shimano M6100 cassette. Should I buy M7100 cassette instead for replacement?
It’s mostly about weight savings. The Deore (M6100) has all sprockets made out of steel. The SLX (M7100) has the biggest sprocket made out of aluminium. The XTR (M9100) has the three biggest made out ...
- 25k
6
votes
Accepted
Can shifting front derailleur while not peddling cause damage
Most likely that no damage has been done. If the front derailleur (FD) was forced very hard it is conceivable that some damage could occur, but it is unlikely. Also, the six-hour time duration ...
- 5,475
6
votes
Accepted
Rear wheel cassette, hub and speed set compatibility question
Hello and sorry to hear your wheel got stolen.
First consideration to make is whether you will be buying a second hand wheel with the cassette already fitted or buying a wheel and cassette separately. ...
- 1,699
6
votes
Inexpensive mods for decathlon 7 speed road bike
It all comes down to your budget. I'd love a new bike, but it would be a significant cost.
Instead you should address specific points
What bothers/hurts you? The saddle is one of the three main ...
- 114k
6
votes
What is the specification for the Shimano Hyper Glide cassette spline?
Here's a (reverse) engineering drawing: https://www.peterverdone.com/hyperglide/
Note the splines need to be a slightly loose fit, as freehubs usually have burrs on the splines from steel sprockets ...
- 2,308
6
votes
Are shimano 6700 and 6703 chainrings compatible?
The FC-6703-specific 52-tooth outer chainring is Shimano model number WP-Y1LK98030.
The FC-6700-specific 52-tooth outer chainring is Shimano model number WP-Y1LJ98150.
Yes, the FC-6700 outer chainring ...
- 5,475
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