SimXPro Bottom-to-Side Mount Set 290mm: When to Use It
By SimXPro l Sim Racing Shop | Published: 2026-11-03
Category: Buying Guides
A 290 mm bottom-to-side mount set turns a bottom-mount seat into a side-mount setup. Here is exactly when that swap helps and when it does not.
Quick answer
Buy the SimXPro Bottom-to-Side Mount Set 290mm only if your seat has bottom mounting holes spaced 290 mm apart and you need side-mount adjustment or compatibility. If your seat already has side mounting points, or the hole spacing differs, this set is the wrong part.
Why a 290 mm bottom-to-side bracket exists
Many sim racing seats are built with bottom mounting points, which limit you to bolting the seat directly to a flat deck or profile rails. A side-mount chassis, by contrast, lets you tilt the seat and change its height without redrilling the deck. This bracket bridges those two worlds, but only for seats whose bottom holes are exactly 290 mm apart.
That 290 mm figure is the whole decision. It is not a universal adapter, and the catalog does not list alternative spacings or slot-based adjustment for this set. Treat the measurement as a hard fit requirement, not a starting point.
The trade-off: adjustment versus simplicity
Adding a bottom-to-side bracket introduces an extra interface between your seat and the rig. That can be worthwhile when you need side-mount positioning, but it also means more bolts to check and one more place for movement to develop. If your current bottom-mount seat already sits at the right height and angle, the bracket adds complexity without solving a real problem.
The set is also specific to seats with 290 mm bottom spacing. A seat with a different pattern, or one that is already side-mount, should use a direct side-mount solution instead. The catalog does not claim compatibility outside that spacing, so do not assume it will fit a nearby measurement.
Check your rig before you commit
This bracket changes how the seat attaches, not how the rig is built. Your aluminium profile rig still needs side-mount rails or brackets at the correct width to receive the converted seat. Measure the seat's bottom hole spacing first, then confirm your rig can accept a side-mounted seat. If either check fails, the mount set will not get you a usable seating position on its own.
Decision rules for the 290 mm mount set
- Measure the seat first: Use a tape measure across the centres of the two bottom mounting holes. Choose this set only if that distance is 290 mm. If the spacing is not 290 mm, stop here and look for a seat-specific or slotted side-mount bracket instead.
- Confirm you actually need side mounting: Pick the set when you want side-mount height or tilt adjustment, or when your rig's seat rails are side-mount only. Skip it if your bottom-mount seat already fits your rig comfortably.
- Check the rig side: Make sure your aluminium profile rig has side-mount rails or brackets that will receive the converted seat. The mount set converts the seat, not the rig. If the rig has no side-mount provision, budget for that hardware as well.
- Plan for extra fasteners: Expect to bolt the bracket to the seat and then the seat assembly to the rig. Check and retighten these joints after the first sessions.
Product facts
- SimXPro Bottom - to - side Mount Set 290mm: Designed for seats with 290 mm spacing between the bottom mounting holes. Measure your seat's bottom holes before ordering; a different spacing means this set will not bolt up.
SimXPro Bottom - to - side Mount Set 290mm
Who should buy it
Best for
- Drivers with a bottom-mount seat whose holes are exactly 290 mm apart
- Rigs that already use side-mount seat rails and need a compatible seat
- Builders who want side-mount tilt or height adjustment from a bottom-mount seat
Not for
- Seats with bottom hole spacing other than 290 mm
- Seats that already have side mounting points
- Rigs with no side-mount rails or brackets to attach the converted seat
