Question 1

How many spokes should a cluster have?

Accepted Answer

There's no fixed number — the right size depends on how many distinct subtopics the subject warrants. A small cluster of four to six spokes covering the most important questions is more valuable than twelve thinly written posts that restate the same ideas. Start with the three to five most searched subtopics and build from there as you identify real audience questions that aren't yet covered.

Question 2

Can a page belong to more than one cluster?

Accepted Answer

Yes. A page that sits at the intersection of two topics can link to pillars in both clusters. This is actually useful — it creates a bridge between topic areas and distributes authority across both. Just make sure the page is genuinely relevant to both clusters and the internal links are contextual, not forced. Avoid creating a sprawling web of links that doesn't reflect real topical relationships.

Question 3

Does the pillar have to be the longest page in the cluster?

Accepted Answer

Not necessarily, but it often is. The pillar covers the topic broadly — which typically requires more words to do well. More importantly, the pillar should link to every spoke and introduce each subtopic enough that a reader knows what they'll find if they click through. Some spokes on narrow technical topics may end up longer than the pillar; that's fine as long as the pillar still functions as the navigational hub.

Question 4

What's the difference between a topic cluster and a content silo?

Accepted Answer

Siloing (in the strict SEO sense) means restricting internal links so that each topic area is completely separate — minimising cross-linking to keep authority contained within each section. Clusters are looser: they encourage cross-linking between related topics where it's genuinely useful. In practice, for most sites, a cluster model is easier to maintain and performs at least as well. Hard siloing is more relevant for very large sites with thousands of pages and complex authority flow considerations.

Question 5

How long does it take to see results from organising content into clusters?

Accepted Answer

For an existing site retrofitting links onto already-indexed content, initial movement can appear within a few weeks as Google recrawls the new internal links and reassesses the pillar's topical signal. More substantial ranking improvements — the pillar earning head-term positions, spokes climbing for their long-tail targets — typically take two to four months as the authority signal compounds across multiple crawl cycles. Building a cluster entirely from new content takes longer simply because the content itself needs to be researched, written, and published before any linking benefit can apply.

Question 6

What if none of my existing content forms a clean cluster?

Accepted Answer

This is more common than it sounds, especially on sites that grew through outsourced, keyword-by-keyword content briefs with no shared strategy. Start by grouping existing posts by audience question rather than by exact keyword — content that answers genuinely related questions can still form a cluster even if it wasn't written with that in mind. Posts that don't fit any theme at all, get little traffic, and can't be reasonably linked into a cluster are usually better candidates for consolidation or removal than for forcing into a structure they don't belong in.

pillar pages

Topic Clusters Explained: Pillars, Spokes and Internal Links