OneUp Dropper Seatpost V2 All Sizes
OneUp Dropper Seatpost V2 Head
OneUp Dropper Seatpost V2 Back
OneUp Dropper Seatpost V2 Compressed
OneUp Dropper Seatpost V2 Extended
OneUp Dropper Seatpost V2 Keyways

Dropper Post V2

1C0747

Regular price $248.00 Sale price$215.00 Save $33.00
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Shipping calculated at checkout.
Diameter
Drop

All our OneUp Dropper Posts are the latest models with the V2.1 actuator.

The OneUp Dropper post is now available in 90 mm, 120 mm, 150 mm, 180 mm, 210 mm and 240 mm lengths and all can be shimmed down in travel by 10 or 20 mm. Have a look at our sizing guide below to get the maximum amount of drop, or watch the video to see just how easily you can install drop reducing shims. (27.2 mm posts use a different cartridge and can't be shimmed down)

OneUp have been obsessed with shaving every last millimetre from the latest OneUp post to give you the shortest stack height and shortest total length of any dropper post. No other post can get your saddle lower.

Cable actuated with reliable sealed cartridge internals for easy home servicing and includes travel adjust shims allow you to custom tune your post to dial in your perfect length.

Re-branded TranzX posts and overcomplicated, unreliable posts dominate the dropper post market. OneUp's dropper offers something better, a reliable, long-lasting post with class leading specs, innovative useful features AND real value. We also stock service items and spares to keep your post performing like new, check out the parts diagram below for anything you need. Basic seal regreasing as part of your normal bike servicing routine is easy, just follow the video below.

Posts are supplied without a remote lever. You can choose a remote here.

UK Delivery

Orders Over £50 – Free (Royal Mail)

Orders Under £50 – £4.95 (Royal Mail)

FedEx £5.95

Our standard delivery time is 3–5 working days. We do our very best to deliver orders within this time, but occasionally there are delays outwith our control, caused by either suppliers or couriers.

UK Bike Delivery

We offer free UK delivery on all bikes unless bought through a Ride To Work Scheme.

We don't currently deliver complete bikes outside the UK.

Custom-built bikes can be delivered in kit form (for you to assemble) – we can include shipping to your country in your quote.

International Orders

Due to the number of delivery options, the best way to get a shipping price is to add what you would like to your basket and begin the checkout. You'll be able to see the shipping price before you checkout.

Unless IOSS applies (see below) our website will remove UK VAT. You are likely to be liable for tax and duties in your delivery country.

IOSS - EU Orders Under £130

Tax and duties will be calculated at the checkout. Once you have paid 20Twenty, you will have nothing to pay in your delivery country.

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OneUp Dropper Post FAQ's

Start by using your current post to measure the maximum insertion your frame will allow (F), then measure the distance from the seat clamp to your seat rails (B).

20Twenty Dropper Post Size Guide
30.9, 31.6 and 34.9 Diameter Dropper Posts
Drop A
Total
Length
(mm)
B
Stack
Height
(mm)
C
Max
Extension
(mm)
D
Minimum
Insertion
(mm)
E
Effective
Length
(mm)
F
Insert
Length
(mm)
240 610 273 400 195 595 337
230 (240
Shimmed
600 263 390 195 585 337
220 (240
Shimmed)
590 253 380 195 575 337
210 540 243 375 150 525 297
200 (210
Shimmed)
530 233 365 150 515 297
190 (210
Shimmed)
520 223 355 150 505 297
180 480 213 345 120 465 267
170 (180
Shimmed)
470 203 335 120 455 267
160 (180
Shimmed)
460 193 325 120 445 267
150 420 183 315 90 405 237
140 (150
Shimmed)
410 173 305 90 395 237
130 (150
Shimmed)
400 163 295 90 385 237
120 360 153 255 90 345 207
110 (120
Shimmed)
350 143 245 90 335 207
100 (120
Shimmed)
340 133 235 90 325 207
90 290 123 205 70 275 167
80 (90
Shimmed)
280 113 195 70 265 167
70 (90
Shimmed)
270 103 185 70 255 167
27.2 mm Diameter Dropper Posts
Drop A
Total
Length
(mm)
B
Stack
Height
(mm)
C
Max
Extension
(mm)
D
Minimum
Insertion
(mm)
E
Effective
Length
(mm)
F
Insert
Length
(mm)
120 410 153 306 90 396 257
90 340 123 236 90 326 217

These are OneUp's quoted weights for the current V2 dropper posts.

Weight 27.2 mm 30.9 mm 31.6 mm 34.9 mm
240 mm 648 g 668 g 812 g
210 mm 570 g 590 g 710 g
180 mm 525 g 545 g 660 g
150 mm 480 g 500 g 605 g
120 mm 435 g 435 g 450 g 545 g
90 mm 377 g 377 g 430 g

Yes! We stock a full range of spare parts for OneUp dropper posts. OneUp designed their post to be user-serviceble, but we can service your post for you if you prefer.

20Twenty Dropper Post Size Guide
AVAILABLE SERVICE KITS INDEX NUMBERS
Seat Clamp Kit - SP1C0043 1,2,3,4,5
V2 Travel Shim Kit - SP1C0051 8d,18
V2 Dropper Rebuild Kit - SP1C0053 8,8a-e,9,10,11
V2.1 Actuator Kit - SP1C0060 15,16,17
V2 Oversized Pin Kit - SP10061 19,20
CARTRIDGES
120MM: SP1C0047
(Excludes 27.2)
6,13,14
150MM: SP1C0048 6,13,14
180MM: SP1C0049 6,13,14
210MM: SP1C0050 6,13,14

INDEX QTY DESCRIPTION SERVICE PART KIT
1 2 CLAMP NUT SP1C0043
2 1 UPPER CLAMP SP1C0043
3 1 LOWER CLAMP SP1C0043
4 2 CLAMP BOLT SP1C0043
5 1 SEALING VALVE CAP SP1C0043
6 1 CARTRIDGE LOCKRING SAME AS CARTRIDGE
7 1 UPPER TUBE N/A
8 1 MID CAP ASSEMBLY SP1C0053
8a 1 SEAL SPRING SP1C0053
8b 1 SEAL SP1C0053
8c 1 MID CAP SP1C0053
8d 1 MID CAP ORING SP1C0053 OR SP1C0051
8e 1 DU BUSHING SP1C0053
9 1 UPPER BUSHING SP1C0053
10 3 GUIDE PINS SP1C0053
11 1 LOWER BUSHING SP1C0053
12 1 LOWER TUBE N/A
13 1 CARTRIDGE WASHER SAME AS CARTRIDGE
14 1 CARTRIDGE SP1C0047 - 120 mm
SP1C0048 - 150 mm
SP1C0049 - 180 mm
SP1C0050 - 210 mm
15 1 BUMPER SP1C0060
16 1 ACTUATOR SP1C0060
17 2 LOCK BOLT SP1C0060
18 6 TRAVEL SHIM PIN 10MM SP1C0051
19 3 OVERSIZED PIN 2.02 SP1C0061
20 3 OVERSIZED PIN 2.04 SP1C0061

Each post includes a set of travel shims and a sachet of low friction grease for the bush. See below for a video showing you how to regrease the top bush. It's a two-minute job that will keep your post running smoothly for longer.

Remote levers are sold separately, as are remote lever clamps. Cables and nuts are included with the remotes.

OneUp Dropper Post v2

Travel Shim Adjustment

Here's how to quickly reduce the travel of your OneUp Dropper post by 10 mm…

Play

OneUp Dropper Post V2

Bushing Greasing

This should take 5 mins or less and can be done with your Dropper Post on your bike. Same process for V1 or V2 posts.

Play

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Customer Reviews

Based on 55 reviews
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L
L.W.

Mike was happy to change my order after last minute deciding to go for andifferent size and was very communicative when any questions were asked! Haven't used the dropper yet but it goes up when I try so I'm happy

Y
Yves M.
One Up 210

Great dropper.
I have a JAM2 size L and this dropper is nearly comlete in the seattube, 4 cm looks out.

S
Stef
200 pound seat post

With all due respect to all cyclists out there, I'm in no way a professional but 1 thing I can professionally say is that 200 British pounds for a seat post is way out of the realm of an average cyclists. Peace.

K
Kier f.
So far so good

Fitted easily, just need to get the pressure’s right

E
Edd J.
OneUp Dropper shipped within the hour

Great price, website not complicated and worked very well and then shipped within the hour. Could not ask for more. Thanks. Happy New Year 🥳