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—smooth, fast, and fatigue-free!

RACE READY RIGIDITY - Forged aluminum design ensures torsional stiffness for confident climbs and sprints.
CUSTOM TUNED COMFORT - Five swappable elastomers let you dial in your perfect ride feel.
PLUG PLAY COMPATIBILITY - Fits standard 28.6mm steerer tubes and 31.8mm handlebars for easy installation.
RIDE SMOOTHER GO FURTHER - Up to 70% bump and vibration reduction for all-day comfort and control.
PRECISION SUSPENSION TRAVEL - 20mm vertical compliance balances shock absorption with rock-solid steering.

The REDSHIFT ShockStop Suspension Stem is a high-performance bike handlebar stem engineered to reduce up to 70% of road vibrations and bumps. Featuring 20mm of vertical suspension travel and five interchangeable elastomers, it offers customizable comfort without compromising steering precision. Crafted from forged aluminum for durability and stiffness, it fits standard 28.6mm steerer tubes and 31.8mm handlebars, making it ideal for road, gravel, hybrid, and e-bikes seeking enhanced ride quality and reduced fatigue.

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Item Package Dimensions L x W x H	7.83 x 2.8 x 2.01 inches
Package Weight	0.37 Kilograms
Item Dimensions LxWxH	19.69 x 19.69 x 11.02 inches
Item Weight	10.08 ounces
Brand Name	REDSHIFT
Model Name	Stem
Color	Black
Material	aluminium
Suggested Users	unisex-adult
Manufacturer	Redshift Sports
Part Number	RS-40-03
Model Year	2018
Style	Stem Angle: 6 Degree
Included Components	Suspension Stem
Size	Length: 110mm

REDSHIFT ShockStop Suspension Stem for Bicycles, Shock-Absorbing Bike Handlebar Stem for Road, Gravel, Hybrid, and E-Bikes

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