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Description
diff gear ratio BMW Differential Gear ratio Swap set - Essential for smooth gear ratio changeBMW Gear Ratio Swap Set Complete Installation Kit (168 188 210 mm) Thinking of changing the gear ratio of your BMW differential? The RacingDiffs Gear Ratio Swap Set includes all essential components to complete a precise, reliable swap and unlock better acceleration, drivability, and overall performance. Key Features Complete kit: Everything required for a seamless gear ratio change with factory level precision. Performance gains: Tailor acceleration,
BMW Gear Ratio Swap Set — Complete Installation Kit (168 / 188 / 210 mm)
Thinking of changing the gear ratio of your BMW differential? The RacingDiffs Gear Ratio Swap Set includes all essential components to complete a precise, reliable swap and unlock better acceleration, drivability, and overall performance.
Key Features
- Complete kit: Everything required for a seamless gear ratio change with factory-level precision.
- Performance gains: Tailor acceleration, top speed and gear spacing to your driving style and tracks.
- OEM-grade quality: Components meet or exceed OEM specs for durability and long service life.
What’s in the Box
- Adjustment Shim Set / C-Clip Set — ensures proper alignment and backlash adjustment.
- Pinion Oil Seal — maintains lubrication and prevents leaks.
- Large Pinion Bearing — to press onto the new pinion gear.
- Crush Sleeve Shim — for setting correct pinion preload.
- Pinion Depth Shim Set (3.3–3.7 mm) — precise pinion depth positioning.
Performance Benefits
- Stronger acceleration with shorter final drives; or reduced cruising RPM with taller ratios.
- Improved drivability by matching ratio to engine power band and tire diameter.
- Long-term reliability when preload/backlash are set correctly during assembly.
- Expert support — guides and resources to help you complete the swap confidently.
Fitment Confirmation
- Use the BMWFans.info database: Follow this guide video to identify your differential type and parts: How to check diff type.
- VIN check: Send us the last 7 digits of your VIN and we’ll confirm the correct set for your car: Contact RacingDiffs.
Works with common BMW differential sizes: 168 mm, 188 mm, and 210 mm. Verify exact application before ordering.
Technical Specs / Installation Tips
| Pinion depth | Set using the Pinion Depth Shim Set (3.3–3.7 mm). Verify with contact pattern. |
| Pinion preload | Establish with the Crush Sleeve Shim per BMW specs (feel for smooth rotation, no end play). |
| Backlash | Adjust via Adjustment Shim / C-Clip Set until within spec; measure at ring gear with a dial indicator. |
| Sealing | Install the new Pinion Oil Seal; lightly oil lips; inspect yoke surface for grooves. |
| Fasteners | Clean threads, apply medium-strength threadlocker to ring-gear bolts, torque in a star pattern to BMW spec. |
Re-check preload and backlash after the first heat cycle or track session.
OEM Cross-References (Backlash Adjustment Shims)
| Diff Size | OEM Part Numbers |
|---|---|
| 168 mm | 33139065731 / 33-13-9-065-731 / 33 13 9 065 731 / 33.13.9.065.731 33139065732 / 33-13-9-065-732 / 33 13 9 065 732 / 33.13.9.065.732 33139065733 / 33-13-9-065-733 / 33 13 9 065 733 / 33.13.9.065.733 |
| 188 mm | 33139065734 / 33-13-9-065-734 / 33 13 9 065 734 / 33.13.9.065.734 33139065735 / 33-13-9-065-735 / 33 13 9 065 735 / 33.13.9.065.735 |
| 210 mm | 33139065736 / 33-13-9-065-736 / 33 13 9 065 736 / 33.13.9.065.736 33139065737 / 33-13-9-065-737 / 33 13 9 065 737 / 33.13.9.065.737 |
If you’re unsure about compatibility, send us the last 7 digits of your VIN and we’ll confirm the correct set for your build.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Excellent Ergonomic Mouse for Long Workdays
Number of Items: 1
If you spend many hours at a computer and are looking for a comfortable, high-quality mouse, I highly recommend the Logitech MX Vertical. It has made a noticeable difference in my daily comfort and productivity.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
★★★★★ 5
9.8/10, would buy again!
Number of Items: 1
I bought this mouse in Sept 2020 and it's been absolutely fantastic. Only now, 5 YEARS later, and under extremely heavy usage in both work and gaming pretty much every day, has it started to wear out and develop an issue with the left click button. Most mice don't last anywhere near that long under the same conditions but this thing was a freaking soldier!
Pros:
Vertical angle - this is the main reason to buy this mouse and I did notice after extended use sessions, significantly less strain on my wrist at the end of the day/night. FYI I also have a wrist wrest on my mouse pad to fully maximize this benefit. The 57 degree angle felt really good to me and didn't inhibit my usage or performance in any way.
Build Quality - Solidly built to handle the needs of the most demanding power users.
Battery - The battery life lasts a super long time and it warns you when its getting low, plus you can still use it while its plugged it and charging. Charging time is fast and I haven't noticed any significant drop in battery lifetime over many charge/discharge cycles.
Sensor - The DPI is high enough for gaming and also variable enough that you can lower it with a single button push to allow a 'normie' to use it when needed. Doesn't require a larger initial movement to begin tracking, making very fine and intermittent adjustments possible.
Scroll Wheel - Each single 'tick' of the scroll wheel is soft enough that if you need to scroll a lot you can make it go several at a time easily for faster scrolling. Also its completely silent when scrolling slowly.
Coating/Materials - The rubber grip is nice and not difficult to clean with a good spray and a microfiber cloth. The glide coating on the bottom held up very well and it still slides across the pad smooth as butter. The buttons have a matte texture to them that feels premium, which held up fairly well to being worn down.
Weight - Well balanced, not too heavy, not too light. It's not adjustable like some high end gaming mice but tbh it doesn't really need adjusting anyway.
Bells and Whistles - The multi device sync also works flawlessly and connects to the other devices very quickly when you switch with the button on the bottom. I never got to playing around with 'Flow'.
Software - Come free of any bloatware extras and doesn't appear to consume any more system resources than it needs to while running in the background.
Cons:
The price maybe? You could easily spend more than this on a mouse and end up with an inferior product. ~$90 every five years isn't terribly unreasonable for something that works this well for >8 hours a day every day. If you don't clean it regularly the coating can get a bit oily after a while, and you pretty much have to use a microfiber cloth as nothing else leaves it clean. Sometimes on a hot day it can leave your hand getting a bit sweaty, not because the mouse produces any heat (it doesn't) but because the grippy coating will absorb warmth from your hand and hold on to it for a bit. Maybe the texture on the main buttons could be a little more wear resistant. Eventually I wore off a small fingerpad sized spot on the left click button and that super smooth bit of plastic ends up feeling kind of oily even though its clean.
Final thoughts:
9.8/10, would buy again. The only thing I really wish this had was the ability to adjust the vertical angle. After some very long use sessions being able to switch to a slightly shallower angle would help to reduce the eventual strain even further. And if we're shooting for the moon here, I'd love it if you could swap out the outer body to a ventilated/open style body like GravaStar's mice to keep your hand from ever getting sweaty.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 4, 2025
★★★★★ 5
Better than rechargeable
Color: Graphite
Easy Bluetooth connection and up and running with ease. Buying everything rechargeable, wasn't thrilled to see a replaceable battery until I found the battery was a simple AA battery and when using, simple battery replacement was faster than stopping to recharge. Good quality, compact and works.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 1, 2026
★★★★★ 5
Budget-Friendly Mouse
Color: Graphite
The Logitech M196 Bluetooth Wireless Mouse is a solid budget-friendly option that gets the job done. Setup was quick and easy, and the Bluetooth connection has been reliable. It's comfortable enough for everyday use, and the battery life is good. While it doesn't have premium features or an advanced design, it's a dependable mouse at an affordable price. If you're looking for a basic wireless mouse without spending a lot, this is a good choice.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
★★★★★ 5
⚠️PLEASE READ⚠️
Color: White
This mouse is great but, if you were planning on hooking it up to an iPad or tablet or some kind it will work but, if you’re trying to play a game or something it’s not the best like if you’re trying to play Roblox I doesn’t work because Roblox doesn’t support keyboard and mouse on iOS. BENEFITS this mouse is lightweight, it’s very easy to hook up to devices, it’s very comfortable and smooth but, it’s a little small for me but besides that it’s GREAT. The mouse also looks clean and professional if you’re ever trying to brag😂. It’s also very compatible with all the devices I’ve tried I hope this review was helpful.
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Reviewed in the United States on April 7, 2026
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