Quick Summary
The FOMTOR 31.8 mm bike handlebar stem riser is a 70 mm stem with a 17 degree angle. It is intended for handlebars with a 31.8 mm diameter and a front fork stem diameter of 28.6 mm. The stated weight is 150 g.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Brand | FOMTOR is part of the product name. |
| Product type | Bike handlebar stem riser for selecting the correct stem style. |
| Handlebar diameter | 31.8 mm, so handlebar size is a key fit check. |
| Front fork stem diameter | 28.6 mm, so the fork steerer size must match. |
| Length | 70 mm center distance of the two holes. |
| Angle | 17 degree angle. |
| Weight | 150 g. |
What to Compare Before Buying
- Handlebar diameter: This stem is listed for 31.8 mm bars. Match that to your bar size before choosing a stem.
- Fork stem diameter: The stated 28.6 mm diameter is the other key fit point. Confirm it against your bike’s steerer size.
- Length: The 70 mm length affects the stem reach. Compare it with the cockpit position you want.
- Angle: The 17 degree angle changes handlebar position. Check whether that angle suits your setup.
Compatibility, Size and Fit
This stem is identified as a 31.8 x 70 mm part with a 28.6 mm front fork stem diameter. Those dimensions are the main fit checks for choosing the correct version. If your bike uses a different bar or steerer size, a different stem is needed.
Before You Decide
Confirm the 31.8 mm handlebar size, the 28.6 mm front fork stem diameter, and the 70 mm length before choosing an offer. If the 17 degree angle matters to your riding position, compare it with the setup you want.
Additional Fit Check
Matching the 28.6 mm steerer diameter does not by itself confirm vertical fit. Check that the stem’s clamp height works with the available steerer length and the bike’s headset and spacer arrangement.
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