What do the different sizes mean, like 90mm? Is it a measurement on the bike I need to take? How do I know which size to order for my bike?

It is the length of the stem, center to center. Measure your current stem from center of steering tube to center of (diameter of) handlebar. The longer the stem, the longer the reach. A small change can make a big difference in comfort level. Measure carefully. This is a very nice suspension stem. It takes vibration away from hands.

Is there a sku for ordering one with shims on amazon? my handlebars are 1" (25.4mm)

Shims from Amazon https://www.amazon.com/MUQZI-Handlebar-Aluminum-Bicycle-Conversion/dp/B09BQB9PC1/ref=pd_bxgy_sccl_1/144-7925088-0949638?pd_rd_w=x1LpD&content-id=amzn1.sym.26a5c67f-1a30-486b-bb90-b523ad38d5a0&pf_rd_p=26a5c67f-1a30-486b-bb90-b523ad38d5a0&pf_rd_r=WVEC5RMXZ7MATFBA233V&pd_rd_wg=HciQV&pd_rd_r=d2e06161-e947-4344-b136-a5d96558c876&pd_rd_i=B09BQB9PC1&psc=1

frist of all will this fit a domane alr 31.8 handle bars also do not understand the measurements 6×100 mm

Yes, it will fit. I just installed mine on my Domane SL5. 6 = is the angle of the stem, either 6 degrees rise or 6 degrees lower depending on the way it's installed. 100 = is the length of the stem, from center of steerer tube to center of handlebars.

will this fit my 3 week old Aventon Soltera step though 7 speed ? Thank you

It fits all standard mtb/road/gravel stems, have no idea what size stem your bikes stem takes, sorry.

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🚴‍♀️ Elevate your ride—comfort meets control in every mile!

CUSTOM COMFORT TUNING - Five elastomer options let you dial in perfect firmness without sacrificing stability or control.
UNIVERSAL FIT ZERO HASSLE - Compatible with most modern bikes using standard 1-1/8" steer tubes—easy install, no maintenance.
VERSATILE ANGLES LENGTHS - Flip or reverse the ±6° stem angle and choose from 80 to 120mm lengths to match your ideal riding posture.
RIDE FARTHER RIDE SMOOTHER - ShockStop tech absorbs up to 70% of road vibrations, reducing hand, wrist, and neck fatigue for longer rides.
PERFORMANCE WITHOUT COMPROMISE - Rigid horizontally for sprinting and climbing, yet flexible vertically to smooth out rough terrain.

The REDSHIFT ShockStop Suspension Stem is a high-performance bike handlebar stem designed for road, gravel, hybrid, and e-bikes. It fits standard 1-1/8" steerer tubes and reduces shock and vibration by up to 70%, significantly enhancing rider comfort and control. With adjustable angles, multiple length options, and customizable elastomers, it offers a tailored suspension experience without compromising stability or steering precision.

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TrustScore 4.5 | 7,300+ reviews

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Unit Count	1.0 Count
Item Depth	8 centimeters
Mounting Type	Handlebar Mount
Manufacturer	Redshift Sports
UPC	736313570052
Model Number	975b2d19-477d-4d98-9e7c-3f1431278cc4
Size	6 degree x 80mm
Number of Speeds	6
Usage	Road Gravel Hybrid E-Bike
Batteries Included	No
Golf Club Flex	x
Product Dimensions	4 x 8 x 3 cm; 349 g

REDSHIFT ShockStop Suspension Stem for Bicycles, Shock-Absorbing Bike Handlebar Stem for Road, Gravel, Hybrid, and E-Bikes, fits 1 1/8in (28.6mm) Steerer Tube, 6 Degree x 80 mm..

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