Slovenian Zwift League – Fight for Jersey 2021

Another spring league has been prepared, still on our usual Sunday 10:30 CET timeslot. This one will span over 11 weeks starting from 17th January and only 9 of your best race participations will count to league points. The aim of the game will be Fight for Jersey. There will be two jerseys to figh for: The Yellow jersey and Red jersey.

We hope to see you on Zwift on 17th January! Until the league officially starts join our Friday group workout ride (18:00 CET) where we will test some of the courses from the upcoming league.

More information here: Rules & info / Race calendar / Results

Rouvy events

We had some strong aspirations with winter season and Rouvy aplication and spent quite some work already on it. Unfortunately Rouvy itself is stil a work in a progress and not an easy one either for event organizing by third parties.

But it’s developing and it’s coming. We beleive it is going to offer next level experience one day. Till then, lower picture does give a preety good clue where the future might be.


Do you know the phenomenom called “runda”?

Of course you do. Everybody knows what runda is. Yet, there is no definition what exactly runda is. If you ask ten cyclist what is runda, you will get ten different answers. Is it a group ride? Yes, special kind of. A very fast group ride with no merci for those who snaped of the sleepstream. Is it a race? No, it’s definetely not a race, but it’s still a fair bit competitive. It’s actually a group effort to ride as fast as possible over a standard distance or segment with a pinch of competition near the end. It ussualy ends with a sprint for a table or a sign and can be described as “race for hand shake and beer only”.

First half is ususally extremely fast all-out group ride where everyone is keen to pull at his turn, then in the second half it becomes more tactic. The group is usualy thinner there. Some might start thinking of surviving on local hill, some might calculate for the final sprint, some might simply become tired. And as always, some might be pulling like they have been obsesed by a demon. Sometimes runda can be just a leisure group ride and sometimes it may become fearsome race between friends.

No matter how you take your runda, you will always find someone to ride with. It’s always gonna give you tons of fun and you’ll always find some sore legs the day after. If you love that feeling, this is the right place to be!

Make sure you look at our Runda calendar and join us!

Obrazec za naročanje VirtuSlo kolesarskih oblačil

Nazaj na spletno stran o VirtuSlo kolesarska opremi.

Na fotografijah je majica M + 3cm (HOT različica) ter hlače M +5cm. Pri majicah je možna izbira med HOT/RACE alternativo. Kroja sta pri obeh enaka, to je slim fit z nizkim ovratnikom, le da je HOT namenoma bolj mrežasta in v celoti iz materijala, ki dobro odvaja toploto (za indoor kolesarjenje s streamanjem ali v najbolj vročih dneh). RACE verzije ni na sliki je pa malo bolj stretch, še nekaj gramov lažja, ter iz materijalov z malo bolj gostim tkanjem ki bolje skriva anatomijo kolesarja. Sonce recimo v RACE različici ne more opeči, pri HOT različici pa bi na dolgih vožnjah že znalo biti kaj karirastega vzorca na koži po vožnji.
Drese je možno tudi pomeriti v trgovini AND by Andraž Citycenter v Celju in AND by Andraž Aleja v Ljubljani. Glede navodil o velikosti dresov preverite tukaj ali pa kontaktirate proizvajalca preko

Obrazec za naročanje VirtuSlo kolesarskih nogavic

Nazaj na spletno stran o VirtuSlo kolesarska opremi.

Epicenter JBL Quantum race #1: Time trial results and analyses

Full results page here

Weekend festival has started with qualifying time trial on a 7.1km long uphill Time Trial with 290 meters of climbing. That’s around 4.0% gradient.

One of the purposes of this racing format, with an aprox. 20min all-out effort, was to test a new categorisaton idea, which should make much more comparable groups in terms of performance and ability, according to very different body shapes. The main problem with simple linear Watt per kilogram (w/kg) categorisation well known from Zwift is, that it’s simply not fair for lighter riders. They have to produce much higher relative power than their heavier competitors, and sometimes, specialy on flater courses they simply can’t compete against them, since the difference is simply to big.

However, calculations of speeds with same relative power, but with different rider weights and gradient shows, that for the same speed, the relation never is linear. Even on a very steep climb with 10% gradient, heavier riders need less w/kg to ride side by side with lighter riders. And on a flat ground, the difference is actually much, much bigger. These relations are graphicaly presented on a chart below. There are three curves. They represent relative power needed for a any given rider from 50kg to 100kg to ride at same speed in comparison to a 70kg rider. As it is obvious, even on 10% gradient with hands on tops, this relation is not linear, and on flat road with hands on drops (normal aero road position) the difference is huge!

And here comes the tricky question. Which curve for what gradient shall we use, to group people into narrower categories, so they will be more fair and make bike races more attractive since very different body shapes will be more realisticaly together according to their actual performance?

Let us thinking. Most traditional bike road races are done on a courses, which vary from pan flat to more hilly or mountaneous terrain. Some might be circular, some from point A to point B, some might be simple uphill races from bottom to the top of the hill. But typical or average road races will ussualy be held on mostly flat ground with various amount of climbing and descending in between. Most of the time of any race is actualy spent on flats, than there comes some climb, and after the climb its ussualy also descend. So, if we would use the upper curve for pan flat terrain with highest speeds to denominate categories, once the road would start climbing, climbers would have big advantage. On the other side, if we would use the curve for 10% gradient equalisation, heavier riders would have big advantage on flats and even more on downhills! So we decide, to use a curve for equalisation at 3% gradient. Anything below 3% will be in favor to heavier riders, anything above 3% will go in favor to lighter riders.

That’s way we specificaly choose a time trial on a hill with very moderate gradient to test our hypothesis. 7.1km long course between Iška vas and Gornji Ig has average gradient of 4.1%. We have hypothesised, that according to speed calculations on 3% gradient, all riders (regardless of their weight) will finish the race with a time that will very closely correlate to the result, which would be observed if we would use formula for 3%:

w/kg’ = 0,0003 kg2 – 0,0632 kg + K

Off course, K is a constant that moves the curve up and down.

Once all the riders where in finish, we could analyse their raw data and denominate them into three categories. Here are results:

If we loook into race finishing time order and we can easaly spot the difference in weight of riders and their finishing times according to their relative power. Despite racing on a course with 4% average gradient. Heavier riders where still faster at same relative power (w/kg) ouput.

That’s why we choose not to create categories on a linear basis, but use some sort of curve instead. In our case 3% gradient normalized wkg curve nicely denominate riders into three groups, which will fight in narrower groups.

Since, saturday’s races are every thing else but steady riding, it will be interesting to see, how theese riders compare to each other when they use draft, when they sprint and when they will have to unleash their short term anaerobic power. We would expect huge differences, as this is normal also in real life. Sprinters are different animals to time trialist or climbers, and puncheurs are not the same as rolleurs. Thats the fun of real life.

Goriška pentlja preview

The last runda this winter. It’s spring slowly penetrating into our land, the daylight is longer, long enough for a quick after work ride, and we are simply runing short on runda courses too.

We would ride Goriška pentlja already in december, but some weird bug on RGT server that day ruined event that evening for everybody. No one was able to finish the ride that day.

Goriška pentlja it self is one of the hardest runda courses in entire serié. All the roads IRL are wide, very rolling, but the terrain is all the time a bit up & down. No sleep this time. With 63km and nearly 700vm of ascent it has a lot of volume, and IRL fastest time never exceded 39 km/h average. Expect between 90-120 min for this ride. The first climb comes relatively soon at around 6km mark, but it’s not steep nor is long. Going into the red to survive makes a lot of sence, since you will gain easy ride until main climb of the day, Cerkvenjak climb. Coming after 27km, with 3min30 for fastest IRL times it will split the bunch apart to many pieces.

There is an interesting youtube clip available here where you can get a bit familiar with the roads we will be riding this week.

Medio fondo Kras preview

Do you remember beautyfull Vipavska walley and Palba runda from this january?

Well, we will ride in this part of the world again. Only this time in a counter clockwise direction, and on much bigger loop which will include so scenic (IRL) Kras region.

This is a beautiful IRL course featuring most popular roads on Kras. Right now it’s exactly the time of the year when these roads are very popular for continental riders due warm mediteranic climate and rolling terain perfect for gathering of early spring base miles. Do not expect any long and straight flats here. This is a landscape made for rolling and twisting roads. Yet, do not expect crasy wild climbs and descends either. This is simply constantly waving form of riding on the roads that are constantly in a slight curve left or right or up or down. Time flies here fast.

The course is relatively easy until kilometer 65 when we hit the main climb of the day, Stjak climb. It’s a nice, regular 5k @6% climb. Not the hardest on the world, yet long enough for climbers to attack and try to shake off from heavier and punchier riders. However, even if selection will be made there, there is still some distance to cover until finish line, and if by some scenario groups come together before the end it will be an uphill sprint to the line. Namely, our fondo ends in a super scenic Kras village named Vipavski Križ.

Unfortunately we won’t be able to see it in RGT, so here is a picture to imagine the place and to put it into your list of must visits this summer.

Meanwhile, register here