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SPCK 4-bolt drivetrain kit + tools
219,95€ incl. VAT
SPCK 4-bolt drivetrain kit + tools for BMX Race gives a minimum 2,4% gain in lap times and makes learning easier.
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- Kit composed of :
In stock (can be backordered)
In stock (can be backordered)
In stock (can be backordered)
Description
SPCK 4-bolt drivetrain kit + tools for BMX Race
Benefits of our SPCK 4-bolt drivetrain kit
The SPCK 4-bolt drivetrain kit + tools is a definite advantage for young riders. In fact, our SPCK drivetrain gives a measured gain of between 2,4 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 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
For more details on our chain kit concept, we recommend reading our article.
If you need more information on installation and maintenance BMX chain kit, you’ll find answers to your questions in our FAQ.
⚠️ Compatibility: * Our SPCK drivetrain kit fits all BMX frames except for the following brands: Meybo HSX and Meybo hubs with instant engagement.
Join the AllYoogs community: follow us on social media and discover all our BMX Race innovations
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- Center distance: 104 mm – 4 bolt
- Size : 67 to 73 teeth
- Weight : 31 g to 35 g according to the number of teeth
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- 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
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– 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 drivetrain kit ?
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 SPROCKET | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 |
| 18 | 289,3 | 298,3 | 307,4 | 316,4 | 325,5 | 334,5 | 343,6 | 352,6 | 361,6 | 370,7 | 379,7 | 388,8 | 397,8 | 406,8 |
| 17 | 306,3 | 315,9 | 325,5 | 335,0 | 344,6 | 354,2 | 363,8 | 373,3 | 382,9 | 392,5 | 402,0 | 411,6 | 421,2 | 430,8 |
| 16 | 325,5 | 335,6 | 345,8 | 356,0 | 366,2 | 376,3 | 386,5 | 396,7 | 406,8 | 417,0 | 427,2 | 437,3 | 447,5 | 457,7 |
| 15 | 347,2 | 358,0 | 368,9 | 379,7 | 390,6 | 401,4 | 412,3 | 423,1 | 434,0 | 444,8 | 455,7 | |||
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.
| AllYoogs | SPCK FRONT SPROCKET 4-bolt 104mm – 20 x 1.1/8 TYRE | ||||||
|---|---|---|---|---|---|---|---|
| SPCK REAR SPROCKET | 67 | 68 | 69 | 70 | 71 | 72 | 73 |
| 34 | 320,7 | 325,5 | 330,3 | 335,0 | 339,8 | 344,6 | 349,4 |
| 33 | 330,4 | 335,3 | 340,3 | 345,2 | 350,1 | 355,1 | 360,0 |
| 32 | 340,7 | 345,8 | 350,9 | 356,0 | 361,1 | 366,2 | 371,2 |
| 31 | 351,7 | 357,0 | 362,2 | 367,5 | 372,7 | 378,0 | 383,2 |
| 30 | 363,4 | 368,9 | 374,3 | 379,7 | 385,1 | 390,6 | 396,0 |
| 29 | 376,0 | 381,6 | 387,2 | 392,8 | 398,4 | 404,0 | 409,6 |
| 28 | 389,4 | 395,2 | 401,0 | 406,8 | 412,6 | 418,5 | 424,3 |
2. Development calculated in mm wtih a 20 x 1.3/8 tyre
In the table below,
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 SPROCKET | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 |
| 18 | 299,4 | 308.7 | 318.1 | 327.4 | 336.8 | 346.1 | 355.5 | 364.8 | 374.2 | 383.6 | 392.9 | 402.3 | 411.6 | 421,0 |
| 17 | 317.0 | 326.9 | 336.8 | 346.7 | 356.6 | 366.5 | 376.4 | 386.3 | 396.2 | 406.1 | 416.0 | 425.9 | 435.8 | 445,7 |
| 16 | 336.8 | 347.3 | 357.8 | 368.4 | 378.9 | 389.4 | 399.9 | 410.4 | 421.0 | 431.5 | 442.0 | 452,5 | 463,1 | 473,6 |
| 15 | 359.2 | 370.5 | 381.7 | 392.9 | 404.1 | 415.4 | 426.6 | 437.8 | 449,0 | 460,3 | 471,5 | |||
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.
| AllYoogs | SPCK FRONT SPROCKET 4-bolt 104mm – 20 x 1.3/8 TYRE | ||||||
|---|---|---|---|---|---|---|---|
| SPCK REAR SPROCKET | 67 | 68 | 69 | 70 | 71 | 72 | 73 |
| 34 | 331.8 | 336.8 | 341.7 | 346.7 | 351.6 | 356.6 | 361.5 |
| 33 | 341.9 | 347.0 | 352.1 | 357.2 | 362.3 | 367.4 | 372.5 |
| 32 | 352.6 | 357.8 | 363.1 | 368.4 | 373.6 | 378.9 | 384.1 |
| 31 | 363.9 | 369.4 | 374.8 | 380.2 | 385.7 | 391.1 | 396.5 |
| 30 | 376.1 | 381.7 | 387.3 | 392.9 | 398.5 | 404.1 | 409.7 |
| 29 | 389.0 | 394.8 | 400.7 | 406.5 | 412.3 | 418.1 | 423.9 |
| 28 | 402.9 | 408.9 | 415.0 | 421.0 | 427.0 | 433.0 | 439.0 |
Depending on your child’s characteristics (starting difficulties, saturation…), we can be even more precise in the choice of our SPCK 4-bolt drivetrain kit + tools. Don’t hesitate to contact us by phone or whatsapp, we are here to help you!
Additional information
| Weight | 0,100 kg |
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| Dimensions | 31 × 23 × 3 cm |
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