SPCK 4-bolt chain Kit

Kit !
SPCK 4-bolt chain kit - BMX Race - AllYoogs

SPCK 4-bolt chain Kit

Original price was: 120,80€.Current price is: 116,66€.

Our SPCK 4-bolt BMX race chain kit will give you a minimum 2% gain in lap times and ease of learning.

  • Select your options:
    • Set composed of :
SPCK BMX chain for kids - BMX Race - AllYoogs
SPCK BMX Chain

In stock (can be ordered)

Original price was: 37,49€.Current price is: 36,20€.
SPCK 4-bolt front sprocket – Kids BMX Race drivetrain - AllYoogs
SPCK 4-bolt front sprocket
Original price was: 49,99€.Current price is: 48,28€.
SPCK Rear sprocket - BMX Race - AllYoogs
SPCK Rear Sprocket
Original price was: 33,32€.Current price is: 32,18€.

In stock (can be ordered)

SKU: BDSPCK001EN Categories: , , , Tags: , ,

Description

The SPCK 4-bolt chain kit is a definite advantage for young riders. In fact, our SPCK drivetrain gives a measured gain of between 2 and 2.8% on lap times, and makes it easier to learn how to “start”, manuals… It’s currently the lightest on the market.

We offer a wide range of sizes suitable for children. That’s why we recommend you take a look at our comparison chart to choose the right SPCK sprocket and improve your rider’s performance.

  • Our SPCK 4-bolt chain kit can be fitted to BMX bikes up to frame size “EXPERT” (weight limit 45kg = 99lb).
  • Thanks to the SPCK 27-teeth stainless steel sprocket with the SPCK chain tensioner, it is possible to push the limits of our kit up to “PRO” frames (weight limit 50kg = 110lb).
  • Our SPCK chain breaker is specific and the only compatible one on the market to lengthen or shorten the SPCK chain.
  • The SPCK chain kit is only compatible with SPCK race parts.
  • Patent Pending
  • Designed and developed by AllYoogs. Made in France
  
 

To learn more about the concept of our chain kit, we recommend you read our article.

The SPCK 4-bolt front sprocket

– The special shape of the SPCK front sprocket with 4 fixing bolts is the result of optimisation using Finite Element Method (FEM) simulation. As a result, it increases resistance and significantly reduces weight.

The SPCK rear sprocket

– The special machining of our SPCK rear sprocket at the spline level makes it lighter while maintaining a significant power transmission capacity. Compatible with all cassette type freewheel bodies.
      • Type : rear sprocket for Single-speed cassette (single speed)
      • Size : 28 to 34 teeth
      • Weight : 10 to 15 g depending on the number of teeth
      Choose your SPCK rear sprocket

– AllYoogs front and rear sprockets are machined by CNC in France from 7075 aluminium (more resistant than 6061 aluminium). This material guarantees lightness and above all a very high resistance of the product thanks to the hard anodising that gives it a golden appearance. This treatment ensures a longer life for our products.

How to choose your SPCK 4-bolt chain kit :

  1. Development calculated in mm with a 20 x 1.1/8 tyre

  2. Development calculated in mm with a 20 x 1.3/8 tyre

1.  Development calculated in mm with a 20 x 1.1/8 tyre

In the table below, find the value indicated at the intersection of the front sprocket and the cog of your child.

Example: cog = 16 and front sprocket = 37. The value to take into account = 376,3

CLASSIC FRONT SPROCKET 4-bolt 104 mm – 20 x 1.1/8 TYRE
REAR SPROCKET323334353637
38
39404142434445
18289,3298,3307,4316,4325,5334,5343,6352,6361,6370,7379,7388,8397,8 406,8
17306,3315,9325,5335,0344,6354,2363,8373,3382,9
392,5402,0411,6421,2 430,8
16325,5335,6345,8356,0
366,2376,3386,5396,7406,8417,0427,2437,3447,5457,7
15347,2358,0368,9379,7390,6401,4412,3423,1434,0444,8455,7

To obtain the SPCK equivalence :

In the table, find the values closest to those in the table above (higher values). The value to be taken into account is the one with the smallest cog.

Example with 376,3: the closest values are 378 and 379,7. The smallest cog is 30, so the choice is a 30 cog with a 70 front sprocket.

AllYoogsSPCK FRONT SPROCKET 4-bolt 104mm – 20 x 1.1/8 TYRE
SPCK REAR SPROCKET67686970717273
34320,7325,5330,3335,0339,8344,6349,4
33330,4335,3340,3345,2350,1355,1360,0
32340,7345,8350,9356,0361,1366,2371,2
31351,7357,0362,2
367,5372,7
378,0383,2
30363,4368,9374,3
379,7385,1390,6396,0
29376,0381,6387,2
392,8398,4404,0409,6
28389,4395,2401,0406,8412,6418,5424,3
27403,8409,8415,9421,9427,9434,0440,0

2.  Development calculated in mm wtih a 20 x 1.3/8 tyre

In the table below, find the value indicated at the intersection of the front sprocket and the cog of your child.

Example: rear sprocket = 16 and front sprocket = 40. The value to take into account = 421

CLASSIC FRONT SPROCKET 4-bolt 104 mm – 20 x 1.3/8 TYRE
REAR SPROCKET323334353637
38
39404142434445
18299,4308.7318.1327.4336.8346.1355.5364.8374.2383.6392.9402.3411.6421,0
17317.0326.9336.8346.7356.6366.5376.4386.3396.2406.1416.0425.9435.8445,7
16336.8347.3357.8368.4378.9389.4399.9410.4421.0431.5442.0452,5463,1473,6
15359.2370.5381.7392.9404.1415.4426.6437.8449,0460,3471,5

To obtain the SPCK equivalence :

In the table, find the values closest to those in the table above (higher values). The value to be taken into account is the one with the smallest cog.

Example with 421: the closest values are 423,9 and 424,1. The smallest cog is 27, so the choice is a 27 SPCK stainless steel cog with a 68 front sprocket.

AllYoogsSPCK FRONT SPROCKET 4-bolt 104mm – 20 x 1.3/8 TYRE
SPCK REAR SPROCKET67686970717273
34331.8336.8341.7346.7351.6356.6361.5
33341.9347.0352.1357.2362.3367.4372.5
32352.6357.8363.1368.4373.6378.9384.1
31363.9369.4374.8380.2385.7391.1396.5
30376.1381.7387.3392.9398.5404.1409.7
29389.0394.8400.7406.5412.3418.1423.9
28402.9408.9415.0421.0427.0433.0439.0
27417,9424,1430,3436,6442,8449,0455,3

 

Depending on your child’s characteristics (starting difficulties, saturation…), we can be even more precise in the choice of our SPCK 4-bolt chain kit. Don’t hesitate to contact us by phone or whatsapp, we are here to help you!

Additional information

Weight 0,100 kg
Dimensions 27 × 20 × 2 cm
Size

28 teeth, 29 teeth, 30 teeth, 31 teeth, 32 teeth, 33 teeth, 34 teeth, 35 teeth

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