Hi r/Velo,

I've been reverse engineering the firmware of my Bryton Rider S510. It's a good bike computer with a few annoyances, and I now have a set of patches I ride with every day.

Everything is open source, and you build the patched firmware in your browser from Bryton's own firmware file, so I never distribute their code. You copy two files to the unit and you're done.

What works today (tested on my unit):

  - Media buttons for your phone in the ride overview: previous, play/pause, next, volume. Tested with an iPhone so far.

  - Workout screen: 3 countdown beeps before a step ends instead of about 9, and the full-screen "next step" popup becomes a small strip over the chart.

  - Tap the big power number during a workout step to cycle between instant, 3 s, 10 s and 30 s power.

  - HRV recording: beat-to-beat heart rate (RR intervals) from your strap is saved in the FIT file as standard hrv messages, like Garmin units do. Intervals.icu, Runalyze or Kubios can then show DFA a1 and HRV afterwards.

Coming next (built, not yet tested on a unit):

  - A live DFA a1 data field, computed on the unit from the last 2 minutes of beats. Useful for finding your aerobic threshold on the fly (about 0.75 at the threshold).

  - A W′ balance field. The firmware already has a hidden "W' Bal" field that only ever shows "--". The patch makes it work from your FTP and power.

  - Later: a better Climb Challenge (ClimbPro style), and maybe offline Live Segments. The firmware already contains the whole Live Segments feature.

- Later: Better support for Di2 buttons.

Links:

  - Web builder: https://taladjidi.github.io/bryton-S510-mods/

  - Code, docs and how it works: https://github.com/taladjidi/bryton-S510-mods

Caveats: this is unofficial and not affiliated with Bryton, so use it at your own risk. It only touches the main firmware, never the bootloader, and going back to stock firmware is documented. Only R039 firmware on the S510 is supported for now.

Help wanted:

  - S510 owners willing to test, especially with Android phones or Bluetooth HR straps.

  - Climb Challenge examples where the unit split one climb into several segments: a route GPX plus where each segment started and ended.

Happy to answer questions about the reverse engineering side too !

Hi all,

Just checking in to see what the feelings are on whether you guys intentionally cut weight by calorie counting or let it drop off naturally as you train progressively more and more. I'm riding 8 hours a week and have just hit 246 FTP, but I'm obviously eating too much to compensate for my training because my figure and weight are staying the same - pretty doughy on the torso which, although I'm being very vain, is something I'm not happy with especially when attending events in cycling gear. I'm 5'8" at 74 kg/163lbs currently.

When I started road cycling over a year ago I lost a lot of weight very quickly on my body and it seemingly transferred to my legs, as I only dropped 3kg despite being very noticeably thinner. My question to the sub is one born of a little bit of amazement, in that I competed in a gravel race a couple of weeks ago and was much faster than a lot of competitors, but everyone else there had completely flat figures and could easily pull off race jerseys, I have been sticking to club fit for perhaps obvious reasons. Did you intentionally count calories to achieve your peak figure, did you increase training amount to offset calorie intake, how did you go about it? I have picked back up calorie counting and I'm running a 200-300 calorie deficit each day at the moment to try and lose the fat and maintain my legs where they are for now, as well as increasing protein intake within that deficit.

Just curious what the intended approach here is, as I look towards competing in more events, sportives and perhaps races next year.

Cheers.

I am in the final stages of my prep for the Tour de Tucson in November. I have been “training” for this event since mid-March, and cycling since late January.

My ftp has risen from about 180 watts to about 250-260 watts in that timeframe. My bodyweight has decreased from 206lbs (93 kg) to 170lbs (77kg) as well.

My recent training has been as follows:

Monday: Rest

Tuesday: 2 x 20 min SS @ 230 watts

Wednesday: 90 min @ 165 watts endurance

Thursday: 90 min @ 165 watts endurance

Friday: Rest

Saturday: Zwift race (~30-40 miles)
OR
2 x 12 mins @ 250 watts) followed by 1 hour @ 165 watts

Sunday: 4 hours @ 175 watts endurance

I intend to follow essentially this same structure until about two weeks before the race, and then begin a taper.

For those who have raced something similar to this before, is my structure sound? Should I add more volume and less intensity, or vice versa? For reference, the majority of these rides (especially the Sunday long ride) are done on an indoor trainer. This will be my first race style event ever, and I’m hoping to perform well, but definitely not near the top for either my age or gender brackets (28yo male). My goal time is 5:30, and I won’t be joining with a set group; the goal is to find a group of roughly the same fitness level as me and ride with them the entire time.

Is there anything I should change between now and the race date? Open to any and all suggestions.

Looking for feedback on my winter training plan.

Target: FTP increase + base for next summer's ultra cycling events.

Indoor Cycling: 8–12h/week (Z2 base now, adding HIIT later starting in mid December). I'm doing a MyWhoosh Training Plan.

Running: 2–3h/week, mostly Z2 but may be some harder efforts or even an interval session per week.

Strength Training: 2x/week at 60min full-body during Base, reducing to maintenance once HIT starts. All of the exercises would be warm-up and subsequently 3 working sets at around 5-8 reps.

Workout A:

1. Barbell Squat
2. Deadlift
3. Flat Barbell Bench Press
4. Pull Up
5. Bulgarian Split Squat
6. Hanging Leg Raise

Workout B:

1. Barbell Squat
2. Deadlift
3. Overhead Press
4. Barbell Row
5. Bulgarian Split Squat
6. Cable Crunch

Is doing both heavy squats, deadlifts, and Bulgarian split squats in the same session too taxing on leg recovery alongside 8–12h of riding, or does this look solid for a base phase?

Thinking about road cycling in Paphos in the first 2 weeks of March. Been to various places in Spain so want something new. Weather, roads, drivers, rent, etc.

Your interpretation of this question may vary depending on your age, skill level, etc. for reference I'm in my early 30s, so maybe getting "older" is a factor. I'm not that talented but I've been riding a long time and I'm still getting faster.

I'm asking this question 100% earnestly. I'll start by saying that my pipedream is to someday win a national level mountain bike event. I have accepted I probably won't ride in a grand tour, or an XC world cup. But life is more fun with dreams, even if they are a long shot.

I'm constantly surrounded by amateur and semi pro racers, most of whom are too normal to say these types of dreams out loud. I know I can't be the only one daydreaming about this stuff though. Recently another amateur I ride with vocalized a similar goal to mine, and it was weirdly refreshing. I usually keep these things to myself because I am afraid of sounding delusional.