Transition
Transition Bottlerocket Frame 2027
Transition Bottlerocket Frame 2027
Out of stock
SKU:TR.009.26044
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The Bottlerocket Frame is a starting point for a freeride build with a clear purpose: jumps, steep lines and repeated bike-park laps. Its aluminium chassis is dedicated to 27.5-inch wheels at both ends and comes with a Marzocchi Bomber Air shock in the 225 x 70mm configuration, giving 180mm of rear travel.
C.H.I.P.S. lets you choose suspension progression independently of the higher or lower geometry position. That is useful if you want to change the support through the travel without automatically changing the bike's stance. The bolt-on S.A.L.S.A. rear dropouts provide a further tuning option, with longer 5mm and 10mm versions sold separately.
The frame combines a gravity-cast bottom-bracket section with forged rocker and chainstay-yoke parts. Replaceable rubber downtube guards deal with rock strikes and shuttle contact, and the threaded bottom bracket and UDH hanger give the build familiar service standards.
This is a frame and shock, not a complete bike. A headset is not included. The platform also supports a longer-travel dual-crown configuration, but the supplied shock configuration is 180mm; choose any alternative shock and fork against Transition's compatibility requirements.
Geometry
Manufacturer platform geometry. Paired values are High | Low; single values are shown once by Transition. Optional longer dropouts change rear-centre length. Dimensions in mm unless marked degrees.
| Measurement | S | M | L | XL |
|---|---|---|---|---|
| Reach (mm) | 425 | 421 | 450 | 446 | 475 | 471 | 500 | 496 |
| Stack (mm) | 607 | 610 | 616 | 619 | 625 | 628 | 625 | 628 |
| Effective toptube length (mm) | 538 | 533 | 573 | 568 | 606 | 601 | 638 | 633 |
| Seattube length (mm) | 360 | 390 | 420 | 440 |
| Effective seattube angle (degrees) | 79.4 | 79.0 | 78.7 | 78.4 | 78.2 | 77.8 | 77.7 | 77.3 |
| Saddle height for effective seattube angle (mm) | 600 | 660 | 720 | 780 |
| Actual seattube angle (degrees) | 72.0 | 71.6 | 72.0 | 71.6 | 72.0 | 71.6 | 72.0 | 71.6 |
| Seattube offset at bottom bracket (mm) | 78.2 | 78.2 | 78.2 | 78.2 |
| Headtube length (mm) | 100 | 110 | 120 | 120 |
| Headtube angle (degrees) | 64.0 | 63.6 | 64.0 | 63.6 | 64.0 | 63.6 | 64.0 | 63.6 |
| Chainstay length (mm) | 435 | 435 | 435 | 435 |
| Wheelbase (mm) | 1191 | 1220 | 1249 | 1279 |
| Bottom bracket drop (rear) (mm) | 15 | 20 | 15 | 20 | 15 | 20 | 15 | 20 |
| Estimated bottom bracket height (mm) | 340 | 335 | 340 | 335 | 340 | 335 | 340 | 335 |
Frame compatibility
| Frame material | Alloy |
|---|---|
| Wheel size | 27.5" |
| Sizes | SM, MD, LG, XL |
| Fork offset | 37-51mm |
| Fork axle-to-crown | 577-589mm (Includes Headset) |
| Headset (top) | 44mm Zero Stack (ZS44) |
| Headset (bottom) | 56mm Zero Stack (ZS56) |
| Bb | 73mm BSA Threaded |
| Iscg tabs | ISCG05 |
| Chainring maximum | 38 Tooth |
| Chainline | 55mm Standard (With Guide) / 52mm Optional (Without Guide) |
| Rear brake mount | Post Mount 200mm / 223mm Max Rotor Size |
| Derailleur hanger | SRAM UDH |
| Rear axle | Transition 148mm Axle For UDH (TRB-HAX) |
| Seat clamp | 37mm |
| Seatpost diameter | 31.6mm |
| Seatpost insertion depth | SM: 210mm / MD: 235mm / LG: 270mm / XL: 290mm |
| Notes | Optional +5mm, +10mm Dropouts & Brake Mounts Sold Separately |
| Front travel | 180mm (Single Crown) / 200-203mm (Dual Crown) |
| Rear travel | 180mm (70mm Stroke) / 203mm (75mm Stroke) |
| Shock size | 225mm x 70-75mm |
| Shock hardware | Trunnion Mount Top / 30mm x 8mm Bottom |
For the dual-crown configuration, Transition lists 203mm rear travel with a 75mm-stroke shock; the UK build PDF lists 200mm. This Frame is supplied with a 70mm-stroke shock and 180mm rear travel.
Additional build details
| Seatpost diameter | 31.6mm |
|---|---|
| Hanger | SRAM UDH |
| Rear axle standard | 148mm |
| Fork compatibility | Single crown 180mm; dual crown 200-203mm; confirm shock configuration for any travel conversion |
| Optional parts | 5mm and 10mm S.A.L.S.A. dropouts and brake mounts sold separately |
Transition Bottlerocket support and setup. Consult the manufacturer setup instructions when changing C.H.I.P.S. positions, including shock orientation and clearance.
Highlights
-
Frame material
Aluminium
-
Wheelsize
27.5"
-
Rear travel
180mm
Specifications
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Transition Bottlerocket Frame 2027
Frame
Bottlerocket Alloy, 180mm rear travel as supplied
Shock
Marzocchi Bomber Air, 225 x 70mm
Headset
Not included
Bottom bracket
73mm BSA threaded
Tune support without tying it to geometry
C.H.I.P.S. offers four lower-shock-mount positions, separating the progression choice from the higher or lower geometry position. You can adjust the suspension character and the bike's stance as two decisions, rather than accepting one fixed combination.
Choose your rear-end balance
S.A.L.S.A. uses bolt-on rear dropouts to offer 0mm, 5mm and 10mm length options. The longer options give you another way to change the bike's balance; the 5mm and 10mm dropouts are sold separately.
Protection you can replace
Rubber guards protect the middle and lower downtube from rock strikes and shuttle contact. They are held by fasteners, so worn protection can be replaced rather than leaving the frame exposed.
Support through repeated hard landings
Forged rocker and chainstay-yoke parts use bridges to resist flex in the rear of the frame. Their purpose is to keep the suspension moving consistently under the loads of freeride use.
A compact home for the frame adjustments
The gravity-cast bottom-bracket section integrates the lower shock mounting system while preserving deep seatpost insertion. It achieves the required shape with fewer welds in this part of the frame.