# Carbonology Ultra X LV (K1)

> Flatwater trainer by Carbonology. Canonical page: https://surfskiindex.com/surfskis/carbonology-ultra-k1-lv/
> Cite as: Carbonology Ultra X LV (K1), Surfski Index, https://surfskiindex.com/surfskis/carbonology-ultra-k1-lv/ (checked 2026-10-15). Terms: https://surfskiindex.com/using-our-data/

## Specifications
- Length: 5.2 m
- Beam: 39 cm
- Deck height: 35.4 cm (estimated)
- Layup weights: River Glass Vacuum 11 kg, Hybrid 9 kg, Carbon 8 kg, Carbon Wood Inlay 8 kg
- Usually paddled by: Confident ocean paddlers

## Ratings (Surfski Index estimates)
- Stability band 1–4 out of 10 (editorial estimate, low confidence).
- Speed rated 9 out of 10.

Our estimate from published descriptions and reviews. Low confidence. Speed is our rating. Both are given at the hull's own design weight.

These ratings are Surfski Index estimates, worked out from published dimensions, traced hull shapes where we have them, and reviews. They are not supplied by the maker or timed on the water. How a ski feels depends on your weight, skill, set-up and the conditions, so use them to shortlist skis and paddle one before you buy. Method: https://surfskiindex.com/how-it-works/#limits

Evidence note: This band is a cautious editorial estimate; it is not backed by a hull trace. Qualitative context includes 3 linked sources.

## Paddler weight
Carbonology rates this hull for paddlers from 50 kg to 80 kg.

## Suits
Flatwater racing and marathon for paddlers roughly 50-80 kg. Not an ocean craft.

## Hull
The Ultra K1 at lower volume: same 5.2 m length, 39 cm instead of 41 cm, front deck down from 29.5 cm to 27.5 cm and back deck from 25 cm to 23 cm. Same platform seat, under-stern rudder, splash lip and optional pump. Rated 50-80 kg against the Ultra’s 75-100 kg.

## What works
- Genuine low-volume K1 for a light paddler, not just a narrower one
- Same price as the standard Ultra
- Down-river build available

## Trade-offs
- Not a surfski: needs a spray deck
- Band tops out around 80 kg
- No independent review or owner report

## Generations
- 2017-: Low-volume Ultra for lighter paddlers, 2 cm narrower with both decks dropped.

## Sources
- https://www.carbonologysport.com/ultra-lv-surf-ski/
- https://australianpaddlesports.com.au/product/carbonology-sport-k1-ultra-x-lv/
- https://www.carbonologysport.com/wp-content/uploads/2023/07/EDIT-1-Carbonology-Sport-Catalog-2023-compressed.pdf

## Prices
Current new prices and dealers: https://surfskiindex.com/surfskis/carbonology-ultra-k1-lv/#buy