FAQ
Questions before you order
Will it hold on cobbles?
Both halves are traced from your post, so the post profile resists rotation. Two M4 bolts go into brass inserts, and the label gives the torque and the max device weight, 150 g (an RCT715 is 147 g). A short tether goes to the saddle rails. The first part of each new design hangs under 50 N for a minute, then goes 30 km on cobbles. We ship that design only if its bolts still hold their torque. As of October 2026 these designs are drawn and rendered; photos of the first test prints will go on this page.
Is it safe on my carbon post?
It sits on the exposed post, its lower edge at least 5 mm above the frame's seat collar, where Garmin's band would go. Only the 1.5 mm TPU liner touches the carbon. The halves close onto stops, so the squeeze on the post is set by the drawing. Tighten to the torque on the label; more can crack the clamp. We never clamp carbon saddle rails. Framesandgear, TONS and BeSmartBike sell mounts for carbon aero posts too.
Does it take an RCT715, a Bryton or a Magene?
Up to 150 g, on an insert bought for your exact device. The rear face has four M3 brass inserts in a cross, so the insert can sit at 0° or 90°. The RCT715 and 716 take Garmin's lever-lock insert; the plain quarter-turn one doesn't fit them. Bryton and Coospo need an insert verified for the exact device: some sit 90° off in a Varia socket, and Etsy buyers had their mounts turned for that. For a Magene L508 we check which way yours sits. The drawing names the insert we buy.
My seat pack covers the radar. Which one do I need?
If your saddle has accessory holes (SWAT, Blendr), the saddle arm. It hangs the radar 25, 45 or 65 mm down, set from your bag, and we check the gap with the bag loaded. If there's 40 mm of bare post below the bag, the post clamp can sit lower instead. Either way Garmin wants the radar upright, facing straight back and 250–1200 mm above the road. With a big tour pack and a rack such as a Tubus or an Ortlieb, the rack plate is the easier fit.
My post isn't listed. Now what?
Mark the saddle height with tape, pull the post, stand it on paper and draw round it, with a ruler next to the outline. A photo of that is enough to start; it's how the Sensa rider got a mount that fit. Start with model names; we mark any measurement we still need in red on the drawing, with how to take it. You pay only after you approve that drawing.
Allegro prints are cheaper. Why pay more?
They are, and they work if your post is on the seller's list. One Allegro maker even drew a Sensa mount from a rider's tracing for 69 zł, and it fit. With us you see a drawing and a fixed price before you pay, and every thread is a brass insert. If it doesn't fit, you get a refund or a better part. And if a shop sells a part that fits your bike, we send you the link instead.
