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Slot.It tyres help please.

I don't know whether to put this query here or in the 'grinds your gears' section but can anybody tell me which Slot.It tyres suitable for wood tracks (preferably F22) will fit the SICA44a Mercedes 190e?

Their tyre chart is complete gibberish as far as I can see. The box stock tyre is a 1228C1 but this one is not included in their charts so how are you supposed to work out a suitable replacement? Why can't they just produce a list of which tyres fit which car instead of listing overall tyre size which bear little relation to wheel size? Banghead   Cussing

The chart is useful, but only when you gradually get used to it - and I am not far beyond beginner level...


The stock tyres are C1s, so look across the top part, which divides all the tyres by compounds. In the C1 column is the 1228C2 - that’s a typo and it should be 1228C1.

Moving to the bottom part of the chart, take the stock rear wheel size (usually on the Pendles website) - 15.8 x 8.2 - from the left column and the stock tyre - 1228C1 - from the column headers and you get a 19.8 diameter for that combo of tyre on wheel.

We’re now looking for an F22 compound that fits that hub and gives a diameter on the stock wheel of approx 19.8. The top part of the chart gives three F22 tyres. Finding them in the column headers of the bottom part of the chart shows only two will fit the 15.8 wheels. The PT27s will measure 19.7 and the 1207s will be 19.6. I suspect both will be absolutely fine. The final figure in each column also shows the width - at 10mm, they are very slightly wider than the stock tyres, but that should also be absolutely fine.

The dwg figure is, I believe, the specific mould for the tyre. Some part numbers contain the dwg and the compound (eg 1207F22), but most do not. If you are looking for tyres with different compounds but from exactly the same mould, look at those grouped together in a single column header and then cross-reference with the compounds in the top part of the chart.

All quite labyrinthine, but vaguely satisfying when you think you’ve cracked it... I’m now fully expecting someone to come along and point out my errors!
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Thanks very much Andy. Labyrinthine isn't the word for it, do they deliberately make it difficult or am I just thick? I often buy urethanes from Waspslot and his chart is dead simple with tyre size cross referenced to the cars they fit. If a small hobby trader can do it why can't a manufacturer do it? There aren't that many different sized wheels in Slot.It's box stock range.

I'm with you on this one Brian. 

Even with the knowledge that there's a typo in a column heading I still find it totally unfathomable.

Waspslot is a very sensible person. If only all of them set it out so clearly.

Bruno out here is pretty good but not quite so easy to look up a particular car.

How are the tyres? Good grip and longevity?

Yes, good grip, don't pick up muck from the track and I have never managed to wear out a set so far. I have some cars still running on five year old tyres. I have never found any urethanes that give as much grip as treated NSR ultras but they are way superior to the major manufacturers' box stock tyres.

You guys are just not trying - really.  They even give instructions. Seriously, now i should start my 2020 posts with something nice, but you fellas need taking out back for a slap with several wet bus tickets, and be told to stop being "winging ****"
You are in serious danger of being sent back to elementary slot-school, where you learn what a trigger is, and why cars fall off, and wives have access to count your collection number on a weekly basis - and that would be an unmitigated disaster. You could even yourselves get laughed at by the continentals who eat technical data BEFORE breakfast, and have been known to drink tyre oil while chewing through a flexible chassis for appetisers.

It took me all of 5 minutes to work out what does what, and why.
They are providing the data in a every size fits all sort ofd format, so you can work out the result of almost anything to anything.

- You have to remember, people want to fit all types of tyre to all types of rim - and not just rims.

So let me tell you the easy way.
1) Learn what wheel is on your car - oh come on, you can do that if you really try.
2) Decide what formula you want - Oh I know decisions are hard, its almost as bad as deciding what chocolate to take from the tray
3) read along the line for the wheel until it is below the formula you want, and an outside diameter you can live with.

In reality, most of us live our entire slotting lives on just 2 or 3 lines and in two or 3 columns.

4) Steal the kids/wife's highlighter and mark the 2 or 3 tyres you actually use on the chart., and make intersecting rings between the tyres and wheels with a biro.
5) Cease with the hard thinking and go pour yourself a nice IPA or dark, or a shot of those lovely aromatic vinos the colonists down under send you.

There . . . . now don't you feel better, you have the tyres and you have the drink, and you have a new found focus for all that pent up tyre rage, the condescending twat who wrote this post.

BTW, some resellers also put the O.D. of the tyre when fitted to the range of rim diameters, just to make life and re-checking even easier.

F22 compound
DWG 1171 mould size
Approximate diameter on hubs prior to trueing
15.8mm hubs 19.7mm
16.5mm hubs  20.3mm
16.9mm hubs   20.6mm
17.3mm hubs 21.0mm

And CMOTD - don't you people glue and true your tyres?
F22 are snot hard to true. MUCH easier to glue and true N22- code is PT1171N22, or they have the new PT1207N22 due out any day now as well, for a slightly tighter loose fit and smaller OD.
- But it all depends on your club rules and on what sort of surface you are working with.
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