7Climb v3.0.2

Critical fix

Sensor emission batching to 1Hz — All 8 sensor callbacks (power, HR, cadence, speed, altitude, grade, distance, GPS) previously called emitState() independently, creating ~8 emissions/second. Since each emission carried a fresh timestamp, StateFlow never deduplicated — all downstream engines fired on every callback.

This caused:

• ~8x overcounting of energy (kJ), Normalized Power, TSS, and match burn durations — MetricsEngine and MatchBurnEngine assumed 1 call = 1 second
• ~8x CPU overhead — PacingCalculator ran 20 Newton iterations with trig per call, all 6 engines processed redundantly

Now a single 1Hz timer emits state, and a sensorUpdatedSinceLastEmit guard prevents stale emissions during ride pause (which would inflate kJ/NP/TSS with phantom power data).

Performance improvements

• TacticalAnalyzer caching — getPrimaryInsight() was called 14×/sec (once per data field per second), each time rebuilding all insights with list allocations and sorting. Now cached with 1% progress threshold — recomputes only when the rider moves meaningfully along the climb.

• MetricsEngine running NP sum — Replaced npWindow.sum() (O(30) per tick) with a running sum variable (O(1)).

• PacingCalculator physics cache — calculateTargetPower() runs speedFromPower() (Newton iterations with atan/sin/cos/exp) every tick. Now cached when grade (±0.1%), altitude (±5m), FTP, mode, and athlete profile haven't changed. On a steady 7% climb, physics runs once on entry instead of 3600×/hour.

• PowerZonesGlance composable reduction — Zone bar segments reduced from 20 to 10 in ZonesLarge, ZoneBar, and ProgressBar. 140 → 70 Box composables in the largest layout. Visual difference negligible at Karoo display sizes.

• ClimbDetector ArrayDeque — Replaced mutableListOf with ArrayDeque for O(1) removeFirst() instead of O(n) removeAt(0). Replaced takeLast(N).average() (temporary list allocation) with index-based iteration.

• PhysicsUtils solver — Newton iterations reduced from 20 to 10, convergence tolerance from 0.1W to 1.0W. 1W precision is more than sufficient for pacing advice.

Minor improvements

• Cached activeClimb.value read in extension's main data flow (1 StateFlow read instead of 2 per tick)
• Removed unnecessary @Serializable annotations from 7 transient model classes (LiveClimbState, WPrimeState, ClimbStats, RideMetrics, PacingTarget, MatchBurnState/Match, NextClimbInfo) — none are ever serialized
• Defensive emitJob?.cancel() at start of startStreaming() prevents duplicate timers on Karoo reconnect edge case

Behavioral note

MatchBurnEngine's belowCpCounter >= 5 threshold now means 5 real seconds below CP (previously ~0.6s at 8Hz). This is an improvement: brief power dips during intervals no longer prematurely end a match, matching industry-standard match burn detection behavior.

7Climb v3.0.1

Bug Fixes

• Match Burn: Fixed match duration dropping 5-second grace period — live and saved durations now consistent
• Match Burn: Recovery timer now uses ride elapsed time instead of wall clock — no longer inflates during pauses
• Pacing Strategy: Fixed negative-split overloading exhausted riders — when W' < 60%, second half target no longer exceeds base power
• Pacing Calculator: Added @volatile to profile and mode fields to prevent stale reads across threads
• Power Zones: Fixed potential ArrayIndexOutOfBounds crash with zone bounds check
• Next Climb: Distance and ETA can no longer go negative from GPS jumps
• Metrics Engine: Removed dead variable in NP circular buffer

7Climb v3.0.0

Pro Features, Physics-Based Pacing & 16 Languages

New Data Fields (10 → 14)

• Ride Metrics — NP, IF, TSS, Variability Index, kJ, elapsed time
• Power Zones — live Coggan zone tracking with time-in-zone distribution (7 zones)
• Match Burn — above-CP match detection, kJ burned, peak power, recovery timer
• Next Climb Countdown — distance, ETA, name, category, elevation for upcoming climbs on route

Physics-Based Pacing

• Pacing now uses full physics model (CdA, Crr, mass, altitude-adjusted air density)
• CdA/Crr/bike weight settings now directly affect pacing targets (previously cosmetic)
• Smooth gradient response replaces old stepped lookup table
• Mode-specific speed targets: Steady (92% FTP speed), Race (100%), Survival (80%)

Whole-Climb Pacing Strategy

• Negative-split approach with 4 phases: SAVE → BUILD → PUSH → SPRINT
• Split bias adapts to W' balance — conserves energy when W' is low
• Strategy phase + split targets shown in Large and Medium Wide pacing layouts

Fatigue/Durability Model

• Configurable FTP decay after threshold hours (default: −3%/hr after 2h)
• Fatigue-adjusted FTP feeds into pacing targets automatically
• New Durability section in Pacing settings with toggle, decay rate, threshold

FIT Recording

• 3 new developer fields: Normalized Power, TSS, Match Count

Localization

• 16 languages: Russian, Ukrainian, Polish, German, French, Spanish, Italian, Portuguese, Dutch, Danish, Swedish, Japanese, Korean, Chinese, Arabic, Hebrew

7Climb v2.1.1

Engine Reliability Fixes & Pacing Overhaul

Critical Fixes

• Crash recovery: W' balance now persists to SharedPreferences — survives app crashes and restarts
• PR history preserved: removed destructive database migration that silently wiped climb history on schema changes
• Pacing rewrite: replaced flawed speed-based model with FTP-based pacing (gradient + altitude correction)
• Climb ID stability: GPS-based climb IDs (geo_lat_lon) for reliable cross-ride PR matching
• Memory safety: Flow collector jobs are now tracked and properly cancelled on disconnect

High Priority

• Fixed distanceClimbedKm showing total length instead of distance actually climbed on route climbs
• W' engine no longer freezes on duplicate-timestamp sensor events (min 0.1s dt clamp)
• W' critical alert fires once on threshold crossing instead of spamming every second
• W/kg calculation validates weight > 0 before division
• Tactical analyzer searches only upcoming segments for attack points

Improvements

• W' balance clamped when W'max changes mid-ride; TTE/TTF capped at 1 hour
• Climb detector resets count between rides, tracks max grade per-climb accurately
• Altitude-aware pacing: VO2max correction above 1500m (−6.5% per 1000m)
• Auto-generated climb names ("Cat 2 3.5km") instead of blank labels

7Climb v2.1.0

Hub-and-Spoke Settings, Configurable Detection & Alerts

Settings Navigation

• New hub-and-spoke architecture — main menu with live config summaries
• Dedicated sub-screens: Athlete, Bike, Detection, Pacing, Alerts, About
• Back navigation with arrow header on each sub-screen
• About screen: version, GitHub, Privacy Policy, Contact

Climb Detection

• Sensitivity presets: Sensitive, Balanced, Conservative
• Fine-tune: min grade, min elevation, confirm/end distance
• Auto-detects custom configuration when params diverge from preset

Pacing

• Configurable tolerance: Tight (±5W), Normal (±10W), Relaxed (±20W)

Alerts

• Individual toggles for W' Critical, Steep Ahead, Summit, Climb Started
• Configurable W' alert threshold (default 20%)
• PR alerts now show improvement delta

Glance

• Climb Overview shows live grade/power/W' when no climb is active
• Refined layouts across all 10 data fields

7Climb v2.0.1

SettingsScreen UI overhaul for Karoo 3

• BikeType selector — split into 2 rows (Race/Aero/TT + Endurance/Custom) for larger touch targets
• Surface selector — split into 2 rows (Smooth/Road/Rough + Cobbles/Gravel)
• Increased spacing & padding across all interactive elements (section headers, hints, toggles, cooldown buttons, position selector)
• Expandable arrow — larger and more visible (14sp)
• Full label — "Endur." → "Endurance"

7Climb v2.0.0

Climb Stats, Bike Setup & Validation Overhaul

What's New

Climb Stats Data Field

New dedicated data field for comprehensive climb metrics:

• VAM — real-time vertical ascent meters per hour (rolling 60s window)
• W/kg — instant power-to-weight ratio with intensity color coding
• HR / Cadence — heart rate and cadence tracking during climbs
• Energy (kJ) — total energy expenditure on the current climb
• Elapsed Time — climb duration
• Avg/Max Power, Avg W/kg — summary statistics per climb
• 6 responsive layouts from compact single-metric to full dashboard

Bike Setup

• Bike type presets: Race (7.5 kg), Aero (8.0 kg), TT (9.0 kg), Endurance (9.5 kg), Custom
• Custom bike weight input with per-gram precision
• Physics calculations now use your actual bike weight instead of a hardcoded 8 kg

Critical Power (CP)

• Manual CP override in Advanced settings
• Auto-calculation from FTP × 0.95 when left at 0
• Proper CP/FTP separation for W' balance accuracy

Expanded Presets

• Riding positions: added Aero Drops (CdA 0.270) and TT (CdA 0.220)
• Road surfaces: added Cobbles (Crr 0.010) and Gravel (Crr 0.012)
• Position and surface selectors now show hint text explaining their effect

Improved Glance Displays

• ETA (large): replaced speed with live VAM and color-coded intensity
• Grade (large): shows HR (bpm) and cadence (rpm) instead of power/speed
• Pacing (large): added live W/kg metric with zone coloring
• Next Segment: final segment now shows "LAST SEGMENT" with grade, length, and elevation instead of an empty state

Validation & Architecture

• Single validation layer: removed duplicate range checks from UI — PreferencesRepository is now the single source of truth
• Tightened physics ranges: CdA 0.15–0.60 (was 0.1–1.0), Crr 0.002–0.015 (was 0.001–0.02)
• FTP upper limit raised from 500W to 600W
• Input fields now handle copy-pasted whitespace correctly
• AthleteProfile uses actual bike weight for total mass calculation
• W' engine uses effective CP (manual override or auto-calculated)
• All hardcoded UI strings extracted to strings.xml

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Full Changelog: v1.0.1...v2.0.0

7Climb v1.0.1

Remove unused vibration support (Karoo has no vibration motor), clean up alerts.

7Climb v1.0.0

7Climb v1.0.0 — Initial Release

Real-time climb intelligence for Hammerhead Karoo.

Features

• W' Balance — Skiba differential model with 6 status levels, depletion gauge, time-to-empty/full
• Pacing Engine — Physics-based target power (gravity + aero + rolling resistance + altitude-adjusted air density)
• Climb Detection — Automatic climb detection from gradient when no route is loaded
• PR Tracking — GPS-matched climb history with live time delta comparison
• Tactical Insights — Steep sections ahead, recovery zones, attack points, final kick analysis
• Alerts — W' critical, steep ahead, summit approaching, new PR — with sound and vibration
• FIT Recording — Custom developer fields: W' balance, pacing status, target power, PR delta

Data Fields

9 specialized data fields, each with 6 layout sizes:
Grade, W' Balance, Pacing Target, Climb Overview, Summit ETA, Climb Progress, Climb Profile, Next Segment, Compact Climb

Install

adb install 7climb.apk

Open 7Climb on Karoo → configure FTP and weight → add data fields to your ride profile.

Requirements

• Hammerhead Karoo 2 or Karoo 3
• Power meter
• FTP and weight configured in app settings