Parametric Seat Tube Shim MTB, Road, Gravel, BMX
Print Profile(2)
Description
Adapt more seat posts or dropper posts to your bike frame seat tube!!
Adapt a pivotal 25.4mm post (common BMX size) to 30.9 seat tube ID. (25.34mm OD to 30.83mm ID) x 100mm Long
OR
MAKE YOUR OWN ADAPTER! With my parametric model and print profiles!
Recommended sizes of adapters:
Inner Diameter (ID) | Outer Diameter (OD) | Recommended ID | Recommended OD |
| 30.9 | 36 | 30.84 | 35.93 |
| 31.8 | 34.9 | 31.74 | 34.83 |
| 33.9 | 34.9 | 33.84 | 34.83 |
| 28.6 | 31.8 | 28.54 | 31.73 |
| 31.6 | 33.9 | 31.54 | 33.83 |
| 31.6 | 34.9 | 31.54 | 34.83 |
| 30.9 | 31.6 | 30.84 | 31.53 |
| 30.9 | 33.9 | 30.84 | 33.83 |
| 27.2 | 31.8 | 27.14 | 31.73 |
| 25.4 | 30.9 | 25.34 | 30.83 |
| Choose your own! | Choose your own! |
Printing
Recommend PETG-CF or PET-CF (or maybe a GF filament). Tried EasyPA but it's slippery... Shim head has a relief to prevent cracking/layer separation. Can be printed vertically with no issue, as the forces clamping it are in XY anyway.
It 100% works - perfect fit for my son's mountain bike. However the PA material required additional torque on the seatpost clamp to stop it from slipping. I used the shim to adapt a Spawn Brood Yama Jama Pivotal seatpost to a Rocky Mountain Reaper Mtb.
For Easy PA: 270C Nozz, 50C bed, iron top surfaces, 100% infill 0.6 nozzle with 0.18-0.30 layer height (your choice)
Personally, printing again, I'd go with a CF filament and possibly fuzzy skin for extra friction/grip when clamping down the post. I'd also add friction paste like finish line fiber grip.
Boost Me (for free)
If you like my obscure designs, want to support my work, and also share it with more people, please consider boosting me! If you don’t have any boosts, I appreciate a like, download, and follow. They all motivate me to keep up the good work!
Membership
Consider my subscription or lifetime commercial license to print my models commercially. Only original designs apply (not remixes or derivatives), see my profile for details.
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
Comment & Rating (0)