Manual Corally SP12X (page 25 of 28) (English)

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Choosing th e right tire s

Choose th e best available highest bite tire fo r th e re a r of th e car and th e n balance th e car with th e

fro n t tire s. If th e car pushes or u n d e rste e rs th e n fit fro n t tire s with more grip (so fte r). If th e car

oversteers or hooks th e n fit fro n t tire s with le ss grip (h a rd e r).

Choosing th e right tire diam eter

W hen a tire is new and has a large diam eter it will pr

ovide more grip th a n th e sa m e tire when it has

worn dow n and has a sm all diam eter. Rem em ber th e fo llow ing:

- Larger tire s have more rolling re sistan ce then sm a ller tire s.

- Smaller tire s are not so good over bum ps as larger tire s.

- W hen more ste e ring is re q u ire d use sm a ller re a r tire s or larger front tire s.

- W hen less stee ring is re q u ire

d use larger re a r tire s or sm a ller fro n t tire s.

Tire additive

Once th e correct tire s have been se lected, you have experience of th e best ways to treat th e m and

what th e different diam eter achieve, you can fine tu n e th e car by adjusting th e am ount of additive

used on th e fro n t tire s. Always apply th e additive a cro ss th e fu ll width of th e re a r tire s and on the

inside of th e fro n t tire s. Ensure th at you tre at each fro n t tire exactly th e sam e am ount. The more

stee ring you need, th

e more additive you use on your fro n t tire s.

* Repeated use of th e sa m e se t of tire s with additive can make th e m very so ft. These tire s can easily

be dam aged, th e y wear more quickly and have higher ro lling re sistan ce. The best so lution is to have

se ve ral se ts of th e sam e com pound of tire . You can th e n rota te th e se se ts of tire s to prevent

prem ature so fte n ing and th e y will give lon

ger overall life .

Gear ratio charts

As it is often necessary to change tire s and tire sizes to get th e car dialled into the track, it is

therefore important th a t you know exactly what effect th e se tire size changes will have on th e gear

ra tio. The fo llow ing gear ra tio ch a rts equate motor gear ra tios into linear distan ce tra ve lled along

th e tra ck per re v o lution of th e motor and by doing so ta ke into consid

e ra tion th e tire size used.

How to use th e se charts.

Measure your re a r tire s, find th e chart fo r th e tire size, line up th e appropriate pinion and sp u r gears

used and th e chart will th e n sh o w you th e mm/rev trave lled.

- The higher the num ber th e fu rth e r th e car will trave l per m o to r re vo lution, meaning its geared

higher th a n a low er figure.

- Smaller pinion

s mean low er mm/rev se ttings and larger pinions mean higher se ttings.

- Smaller sp u r gears mean higher mm/rev se ttings and larger sp u r gears mean low er se ttings.

- Higher se ttings mean higher to p speed (u sing more battery energy).

- Lower se ttings mean le ss to p sp e e d but more acceleration (u sing less battery energy).

- A to o high gear ra tio se tting might dam age your motor and cause excessive brush and

com m utator wear.

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Corally SP12X Manual

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