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Your cart is empty.When using the Wolf Tooth GC 42 (50-3898) or GC 40 (50-3899) replacement cogs with a Shimano rear derailleur, a longer B-screw will be needed for proper adjustment. High quality 18-8 stainless steel screw is compatible with most Shimano mountain bike derailleurs. Replaces stock B-limit screw on Shimano MTB derailleurs Use if you are using Wolf Tooth GC 42 or GC 40 large cogs High quality stainless steel
Nagnamis29
Reviewed in Singapore on February 2, 2025
The Wolf Tooth 25mm B-Screw might seem like a tiny, unassuming component, but it makes a huge difference in your bike's drivetrain setup. If you’ve got a Shimano derailleur and are looking to ensure proper derailleur alignment, this B-screw is a must-have.Made from durable materials, it’s designed to provide precision adjustment for your derailleur cage, giving you cleaner shifts and better chain management. It’s especially helpful if you’ve recently swapped to a wide-range cassette or if your original B-screw has worn down.Final Verdict: 9/10 – Simple, effective, and well-made. A small upgrade that improves your bike's performance. 🚴♂️🔩
Dominic
Reviewed in the United States on July 5, 2024
I used this to replace the B limit screw on my Shimano derailleur after it was bent in a particularly muddy mountain bike race. It works perfectly!
Kevin Milligan
Reviewed in the United States on September 24, 2022
Look it's a screw it works perfectly the problem is they just throw the tiny screw in a large envelope and ship it one little hole in the package and goodbye screw and that's exactly what happened to the 1st shipment they sent me another with no questions askef but it took twice as long to get it
A. Bennett
Reviewed in the United States on October 8, 2022
If you want to thumb your nose at Shimano’s claimed largest sprocket size, get this. As long as your derailleur hanger has a large-enough flat for it to bear against, it will work fine for up to 40- or 42-tooth cogs. Some people turn it around, so the head of the screw meets the land to provide support.
Be Belle
Reviewed in the United States on September 11, 2020
Living with the name, it bent badly after 5 rides. This may work with road bike or small adjustment where the B screw does not have to be screw in almost all the way. I had to cut the screw to get it out of the detailer. I ended up went to local ACE hardware and got the same screw for 1/3 of the cost. Then I made some mod to make it stronger.
steve aka Rollingwititfam
Reviewed in the United States on January 5, 2020
This product work like a champ it got me to be able to adjust my Shimano deore rear derailleur so that it wasn't contacting the ultra-large range cassette gear ... I chose the 11:00 my 46 tooth sunrace 10 speed cassette to do a one by conversion.... And without the screw the derailleur would have hit the largest gear.... That's what all screw didn't seem like it but it's save the day must have for one by conversions with large rear cassettes
Phillip
Reviewed in the United States on October 17, 2019
PRICEY, but a must have for pairing newer wide range cassettes wide older derailleurs. I just put a Sunrace 10 speed cassette (11-46) on my 2014 Jet-9 with a 2014 era SLX derailleur and this B-screw was the key to make it all work.
Aaron Weickgenant
Reviewed in the United States on June 26, 2018
Works as advertised. This gave me the extra adjustment I needed when I changed from a 33/11 cassette to a 42/11 cassette with room to spare. Also, the hex key interface is so much easier to use and so much more durable than the phillips head that comes stock.
Rodger Lee
Reviewed in the United States on September 15, 2015
original b-screw with phillips head got mashed. this item allowed me to get my derailler to work with a cog three teeth over spec. the old one was all the way in and did not come out easily. cleaned the eyelet, put some oil in there and on the new threads. it went in easily and the hex head works much better.
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