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Hi Hubbers. I'm coming down for a birthday party on the weekend of the 30th and keen to ride Karkloof on the 28th and 29th, possibly even the afternoon of the 27th (traveling down from Jhb). I don't typically ride alone, can anyone help me with the lay of the land? Are there groups I could join? People who would be willing to ride with me? I have a dual sus trail bike and fairly good skills, but not as fit as I would like. 20km rides are probably my speed
3 minutes ago, TheoG said:As far as I know your Garmin can take a speed sensor. I suggest you get one for better accuracy.
Yeah I got one with the second hand kit, it just needs batteries. I'll look into fixing that up and using it! Then I can k ow THE TRUTH!! (or something closer to it, taking into account tyre pressure, time spent in the air etc etc) 😄
33 minutes ago, Frosty said:Do you, the OP, wait for your device to find satellites before you start every ride?
I'd say yes but it's a factor to consider
44 minutes ago, DieselnDust said:Do you have a speed sensor on the bike and is the gps bike computer set to use it as the main sensor for measuring distance?
No speed sensor
52 minutes ago, dexterdent said:It's because you are faster on the 29er and therefore relativity comes into play
Well my smile is bigger... 😁
57 minutes ago, Shebeen said:you would need to get a 29er specific GPS unit to resolve this issue
The good news is this Garmin came from a 29er! So what I'm reading now must be the accurate reading 🤣
1 hour ago, copperhead said:I don't want to insult anyone but this is the best thread I have ever read. A GPS works off of satellites. So as stated you could be in a humveeeeee and it won't make a difference. Computers work off of a barometer and will almost never be accurate. Starva elevation works off of maps???? So I think it is more accurate. While all the questions and answers i think are legit please do not not hate on me for saying thanks for giving me a smile today. I mean I could even be bloody wrong. It just made me laugh though. So thanks. Okay back to riding.
Glad to bring a smile. Maybe one day I will remember that we made some route change and that's responsible. For now I'm putting it down to a weird confluence of data that looks consistently different!
1 hour ago, RobbyB said:The only way that there can be a difference in distance in wheel sizes is if you have a speed sensor fitted to a 26" wheel and then transfer the speed sensor to a larger wheel (29") and then don't change the wheel circumference on the receiver/GPS unit. This would be the case in this matter (if there is a speed sensor installed) as the bike would be travelling further per wheel revolution but the 26" circumference measurement would give a slower speed/distance travelled therefore resulting in a lesser distance travelled. Does the OP have a speed sensor installed??
No speed sensor, just GPS. It was a good line of thinking though
1 hour ago, Fisan said:The upgrade from 26er to 29er obviously made OP faster, meaning fewer samples on corners, thus shorter distance.
OP should borrow a 27.5" and do the loop a couple of times. This might end the war on wheel sizes once and for all.
#yayitsfriday
LOL, love the way you think! Unfortunately I'm not faster on the new, heavier bike yet, but I love him dearly and I will be quicker soon!
1 minute ago, Eldron said:A few hundred meters is nothing. You never start and stop your computer at exactly the same place and if you do it takes varying time to pick up satellites and start tracking.
Also - GPS tech breadcrumbs - it isn't live so when you take corners etc it may take a sample at different points or even skip a short, tight corner completely if you have your sample rate set to 15 or 20 seconds.
I'm sure the fundies on here will know a few other reasons why GPS is not perfect...
Thanks for the explanation of the sampling, I think it's probably safe to say that this is the real difference, and I'm just picking up a streak of unusual data. The good news I ride the route every week so I will keep on sampling, lol!
1 hour ago, RobertWhitehead said:Funny fact: I had a friend who did the Baviaans both weekends, same route, same distance but major difference in elevation - also Garmin.
Now this may be due to barometric differences between the rides. I believe the devices we use often use barometric pressure to gauge elevation and changes in elevation.
Yeah I also can't see how it would change for such small changea in position. Another spanner in the works. I averaged 5 rides on the 26er and 3 rides on the 29er and I still have a 1.3% difference! At this stage I'm going to put it down to a difference in sampling or some difference in the route that I'm not consciously aware of.
So strange!
OK so I have a strange observation and I wonder if anyone else has experienced something similar. The group I ride with do weekday rides following the exact same route every time. I recently upgraded from a 26 inch bike to a 29 inch bike and my ride distance, measured by a Garmin Edge 820, changed from 15.13km to 14.94km. That's 190m less and is a 1.3% difference.
Now I thought it was a new downhill section that may be shorter, but looking at the map, both rides I'm comparing used the same route! Could it be possible for a Garmin mounted on the handlebars to measure a difference in how I track through corners on these new bigger wheels and could it be that big a difference? It seems so crazy yet I can't (yet?) see another explanation??
So, am I crazy or what?
7
1 hour ago, StevieG said:Holla Trails is my local haunt. I'd be happy to get together and show you a few trails. Drop me a PM and we can exchange numbers. Everything here from easy greens and silvers at 21kms, and then a little more technical pink and red routes, at 28kms. All lots of fun though
Cheers I've dropped you a message!
1 hour ago, Martin PJ said:Sugar Rush is now Holla, you can ride on your own there.
Thanks Martin. I'd love to meet up and ride with a local if possible. Will check out riding alone if I can't make that happen
16 minutes ago, Cabous9 said:Not a group ride, but go check out Holla Trails. About 7km inland from Ballito. Awesome bike park, with great trails. Highly recommended.
Thanks, I think that's the Sugar Rush I'm talking about? From the same place? I'm not keen to ride on my own, I've reached out to friends of a friend. Let's see!
Hi there! Traveling to Ballito this Friday for a week and really keen to ride Sugar Rush and maybe other hidden gems? I'm on my new Momsen Vipa Trail, I've done a lot of MTB multi day events years ago but just getting back into it so my fitness is at the 20km ride stage. Is there anyone in the area that I could join for a ride?
Thanks everyone! I will reach out, Red Barn sounds like fun
Hi there
I got back on the bike (MTB that is) about 2 months ago. I want to spend more time riding with my dad but yesterday I carried on riding with his buddies after he turned back and when I lost the group after Albert's, they suggested that I meet them 5km away and then didn't wait for me, leaving me to find my own way back to the Junction. I felt exceptionally unsafe and have lost trust in this group. I'm looking for new riding buddies. I can ride Tuesdays or Thursdays from about 3h30 from the Junction and Saturdays or Sundays at any location around Gauteng (Northern Farm, Spruit, etc). I'm riding the Junction to Emmarentia and back at about 15km/hr ave and maybe a bit slower on a longer ride while I build up endurance.
Looking for riding partners where sticking together is paramount.
42 minutes ago, TheoG said:There are a lot of options these days. I still prefer Polar, the newer products are much better than the older ones you refer to. Chest measurement will trump wrist every time if you are interested in decent accuracy, if not wrist based should be OKish.
I have a Polar Vantage V watch and a V650 cycling computer. Both of the work with a bluetooth strap, cadence and speed sensors. The watch also do reasonable wrist HR but I avoid it if at all possible.
Alternatively look at the Garmin options. Suunto may also be an option.
Hope this help.
Thanks Theo
41 minutes ago, fanievb said:https://www.easybike.co.za/garmin-forerunner-45s-black.html
wrist based heart rate
I'll go look it up!
8 minutes ago, Robbie Stewart said:I have the Polar V800 which has had a strap and case replacement about 3 years ago. Its disintegrating on my arm again and I am wondering how long before it actually falls off. It came bundled with the H7 chest strap which is also due for replacement as the strap clasp broke but I'd be damned if I want to spend around 2k on replacing just that. The battery is also now only good for a weekend's worth of riding i.e. one longish Saturday and a mild Sunday morning out before needing a recharge. It used to be that I could ride an entire weeks worth of rides between charges. It also is not so smooth on the bluetooth synching anymore either.
I am not sure what to replace it with, if at all. Perhaps I am just going to go analogue and ditch it altogether along with Strava etc.
Good luck. I joined Strava but for a new sign up, it's R600 a year... Not sure I will commit after the 2 month trial...
Karkloof 28-29 April?
in Routes & Trails
Posted
Thanks Steady Spin. Safe for woman to go solo? Cellphone signal in case of difficulty?