4 x Soft guide spring + vertical displacement spiral

A spring that works silently to keep the guide on the track

When preparing a car for competition or simply wanting to maximise its performance on track, the guide is one of the critical points that is often overlooked. The spring that regulates its vertical movement makes the difference between a guide that follows the track faithfully and one that bounces, lifts, or transmits vibrations to the chassis. The Tectime TT901 is designed precisely to eliminate that problem.

Function and performance

The TT901 springs are the soft version within the Tectime range for guides with vertical displacement. Their main characteristic is an extreme softness in both extension and compression: the spring follows the movement of the guide without opposing sudden resistance, preventing any irregularities in the track from being transferred to the rest of the chassis.

• Hardness: soft (ideal for tracks with pronounced joints or uneven surfaces)
• Length slightly greater than the TT900 reference
• Greater number of coils compared to the TT900, which distributes the load more progressively
• Pack contents: 4 springs
• Reference: TT901 — Tectime

Key differences compared to the TT900

The TT900 and TT901 share the same operational philosophy —maximum softness in the vertical movement of the guide— but the TT901 excels in length and number of coils. This translates into an even more progressive response: the spring takes a little longer to reach its maximum compression point, which particularly benefits cars running on tracks with more pronounced height variations or where a particularly floating behaviour of the guide is desired.

Compatibility and installation

These springs are designed for guide systems with vertical displacement, the usual mounting type in slot racing chassis where the guide can move up and down independently of the chassis. Before installation, check that the inner diameter of the spring is compatible with the stem of your guide. If you are unsure between the TT900 and the TT901, opt for the TT901 when seeking maximum softness or when the TT900 proves too stiff for your setup.

Common mistakes

• Installing the spring under excessive tension: compressing the spring too much during installation negates its progressive effect. Adjust the preload just enough for the guide to touch the track without forcing.
• Confusing hardness with length: a longer spring is not necessarily softer; in the case of the TT901, both characteristics go hand in hand, but this reasoning should not be extrapolated to other references.
• Ignoring the condition of the stem: if the guide's stem is bent or has burrs, even the softest spring will not achieve smooth movement. Always check the complete assembly.

Frequently asked questions

How many springs are included in the pack?

The TT901 pack includes 4 soft springs for vertical-displacement guides.

How does the TT901 differ from the TT900?

The TT901 is slightly longer and has more coils than the TT900. This provides a more progressive response and an even smoother behaviour in the extension and compression of the guide.

What type of track is the TT901 most recommended for?

It is especially useful on tracks with marked joints, unevenness, or surfaces where the guide needs to adapt quickly and smoothly. It also fits well in competition setups where it is prioritised that the guide does not transmit vibrations to the chassis.

Is it compatible with any vertical-displacement guide?

It is designed for guides with that mounting system, but it is always advisable to verify the inner diameter of the spring with the stem of your specific guide before installation.

Can I combine TT900 and TT901 springs in the same car?

This is not a common or recommended practice, as the difference in hardness between both ends would create an asymmetrical behaviour of the guide. The most coherent approach is to use the same spring throughout the assembly.

The Tectime TT901 is a pack of 4 soft springs for vertical-displacement slot car guides, featuring more coils and slightly greater length than the TT900 reference. Engineered to deliver ultra-smooth compression and extension, these springs prevent guide movement from being transferred to the chassis, keeping the guide in constant contact with the slot car track. A must-have tuning part for club racers and serious hobbyists looking to fine-tune their car's guide setup.