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I generally have 15, 16, 43 and 44 sprockets either fitted or in the toolbox for trackdays. You only need a torque wrench and a couple of sockets to make a change.

Yes; it?s not too bad for tracks which don?t require longer gearing. 16/43 or 44 is preferable for faster circuits.

Screen https://www.realoem.com/bmw/enUS/showparts?id=0E21-EUR-12-2019-K67-BMW-S_1000_RR_19_0E21,_0E23_&diagId=46_2153

Thermal Technology You can buy the full range of Thermal Technology tyre warmers in the UK from Kippax. https://kippax-performance.co.uk/

Thermal Technology Expensive? but they are the best tyre warmers you will ever own.

Gen 4 M Sport 2021 Forks Torque Settings Upper and lower yoke bolts are 19 Nm and the steering stem nut is 100 Nm. Those figures are from the Service Manual.

Brake Discs There are plenty of places you can buy brake discs from and pricing is all pretty similar. Mode Performance, HPS, RRPS, PHR Performance, Crowe Performance et al, all spring to mind.

More images available here: https://www.worldsbk.com/en/news/2023/UNVEILED%20BMWs%20brandnew%20look%20for%20the%202023%20WorldSBK%20campaign

Akrapovic Racing/Evolution Full System Yes. Part # P-X287. See links below. https://d1sfhav1wboke3.cloudfront.net/ImageServer/Apim2media/Documents/21497/60ab065b-a75f-4836-b5fd-cc47e8f1b662.pdf...

On both the Gen 3 and 4 you need to use 6mm hose (link below) if you want to reuse the OEM brake fluid reservoir. By doing so you avoid the clearance issues. https://fortisracing.co.uk/products/brake-fluid-hose-clear-6-4x9-6mm?variant=30194985009203

ECU Flash Or don?t tell them that the ECU is flashed should you have to make a warranty claim in the future?

Rear Sprocket Fairly pointless unless you are changing the front sprocket size as well.

Exhaust Socket It?s also worth giving the socket a tap with a plastic hammer to make sure it?s fully seated against the bolt before loosening. The inner bolts are difficult to access and if you try and loosen with the socket at an angle you will likely round them off.

Exhaust Socket That?s the one. Try and get a short socket as there isn?t much space unless you remove the radiator.

Exhaust Socket Combination Socket 10.

Brembo +1.

Brembo +1. The weblink below is useful (scroll to the bottom of the page) as it shows you what should be in the box and marked on a genuine Brembo product. https://www.brembo.com/en/company/news/brembo-brakes-guide-to-recognizing-fakes

Brembo RCS Failures I?ve never had any issues with numerous Brembo RCS master cylinders over the years. For perspective you never hear about the thousands of customers who have them fitted with no issues?

Quickshifter Unfortunately not. Virtually nothing is transferable between the Gen 3 and Gen4+.